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Aletheia tackles FirstProof autonomously
Tony Feng, Junehyuk Jung, Sang-hyun Kim, Carlo Pagano, Sergei Gukov, Chiang-Chiang Tsai, David Woodruff, Adel Javanmard, Aryan Mokhtari, Dawsen Hwang, Yuri Chervonyi, Jonathan N. Lee, Garrett Bingham, Trieu H. Trinh, Vahab Mirrokni, Quoc V. Le, Thang Luong
Intelligence
Status: succeeded | Model: Gemma-4-26B-A4B | Prompt: intel-v1 | Confidence: 92%
Last extracted: 7/20/2026, 1:11:38 PM
Summary
This paper reports on the performance of Aletheia, a mathematics research agent powered by Gemini 3 Deep Think, on the FirstProof challenge. Aletheia autonomously solved 6 out of 10 research-level math problems (P2, P5, P7, P8, P9, P10) according to majority expert assessments, with P8 receiving non-unanimous approval. The study highlights the agent's ability to generate rigorous proofs without human intervention in the solution generation process, emphasizing reliability and inference cost as key metrics.
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Relation Signals (5)
Aletheia → participatedin → FirstProof
confidence 97% · We report the performance of Aletheia... on the inaugural FirstProof challenge.
Aletheia → poweredby → Gemini 3 Deep Think
confidence 95% · Aletheia (Feng et al., 2026b), a mathematics research agent powered by Gemini 3 Deep Think
Aletheia → createdby → Google DeepMind
confidence 90% · Work conducted under Google DeepMind
Problem 7 → previouslydescribedas → Open Problem
confidence 88% · At least one (Problem 7) had also been previously described as an open problem of interest
Aletheia → solved → Problem 8
confidence 85% · Aletheia autonomously solved 6 problems (2, 5, 7, 8, 9, 10)... experts were not unanimous on Problem 8
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Abstract
Abstract:We report the performance of Aletheia (Feng et al., 2026b), a mathematics research agent powered by Gemini 3 Deep Think, on the inaugural FirstProof challenge. Within the allowed timeframe of the challenge, Aletheia autonomously solved 6 problems (2, 5, 7, 8, 9, 10) out of 10 according to majority expert assessments; we note that experts were not unanimous on Problem 8 (only). For full transparency, we explain our interpretation of FirstProof and disclose details about our experiments as well as our evaluation. Raw prompts and outputs are available at this https URL.
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- Source: https://arxiv.org/abs/2602.21201v3
- Canonical: https://arxiv.org/abs/2602.21201v3
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fengtony@google.com, thangluong@google.com. External affiliations: UC Berkeley (Tony Feng), Brown University (Junehyuk Jung), Korea Institute for Advanced Study (Sang-hyun Kim), Concordia University (Carlo Pagano), Caltech (Sergei Gukov), Academia Sinica (Cheng-Chiang Tsai), CMU (David Woodruff), USC (Adel Javanmard), UT Austin (Aryan Mokhtari). Aletheia tackles FirstProof autonomously Tony Feng* Junehyuk Jung Sang-hyun Kim Carlo Pagano Sergei Gukov Cheng-Chiang Tsai David P. Woodruff Adel Javanmard Aryan Mokhtari Dawsen Hwang Yuri Chervonyi Jonathan N. Lee Garrett Bingham Trieu H. Trinh Vahab Mirrokni Quoc V. Le Thang Luong* *Project leads. Work conducted under Google DeepMind Abstract We report the performance of Aletheia [feng2026autonomousmathematicsresearch], a mathematics research agent powered by Gemini 3 Deep Think, on the inaugural FirstProof challenge. Within the allowed timeframe of the challenge, Aletheia autonomously solved 6 problems (2, 5, 7, 8, 9, 10) out of 10 according to majority expert assessments; we note that experts were not unanimous on Problem 8 (only). For full transparency, we explain our interpretation of FirstProof and disclose details about our experiments as well as our evaluation. Raw prompts and outputs are available at https://github.com/google-deepmind/superhuman/tree/main/aletheia. 1 Introduction FirstProof [abouzaid2026proof] is a collection of ten research-level math problems that arose naturally in the work of professional mathematicians, and was proposed as an assessment of current AI capabilities. These problems are described by the FirstProof authors as being “Lemmas”, meaning intermediate technical statements rather than open problems of interest for their own sake111At least one (Problem 7) had also been previously described as an open problem of interest Wein23.. The problems were released on February 5, 2026 and given a deadline of 11:59pm PST on February 13, 2026, at which point official (human-written) solutions were published. This report documents the performance of Aletheia [feng2026autonomousmathematicsresearch], a mathematics research agent powered by Gemini 3 Deep Think [gemini3deepthink2026], on FirstProof. The results of Aletheia on a best-of-2 run per problem are displayed in Table 1. Aletheia (best of 2) Expert Evaluation (correct/total) P1 No Output P2 Correct 4/4 P3 No Output P4 No Output P5 Correct 4/4 P6 No Output P7 Correct 3/3 P8 Correct? 5/7 P9 Correct 4/4 P10 Correct 2/2 Table 1: Summary of Aletheia’s performance on FirstProof. The Expert Evaluation column displays the number of experts who rated the solution as being Correct, out of the total number of experts consulted. Only the assessment on P8 was not unanimous. We emphasize that this is a limited study conducted by the team behind the Aletheia agent, with help on evaluations from other experts within Google; it is not representative of Google’s collective efforts on FirstProof. Continuing our practice of transparency in AI for mathematical and scientific discovery [discovery26] and the concept of Human-AI Interaction (HAI) card introduced in [feng2026autonomousmathematicsresearch], we provide below the HAI card for how we have obtained solutions to FirstProof. Human-AI Interaction Card Prompt (problems copy-pasted verbatim from FirstProof .tex file) Human Aletheia Response Verification and extraction prompt (§A) Human Gemini 3 Deep Think Response Raw prompts and outputs: https://github.com/google-deepmind/superhuman/tree/main/aletheia 2 Interpretation of the challenge Since FirstProof was construed as an experimental trial without clearly defined rules, we first discuss our interpretation of the challenge. The FirstProof authors write in the FAQ of 1stproof.org, What constitutes a solution? We consider that an AI model has answered one of our questions if it can produce in an autonomous way a proof that conforms to the levels of rigor and scholarship prevailing in the mathematics literature. In particular, the AI should not rely on human input for any mathematical idea or content, or to help it isolate the core of the problem. Citations should include precise statement numbers and should either be to articles published in peer-reviewed journals or to arXiv preprints. and in the paper [abouzaid2026proof], …it is not yet clear where AI systems stand at solving research-level math questions on their own, without an expert in the loop. Autonomy. Even with these guidelines, we felt some ambiguity about what constitutes an “autonomous solution”. For example: if an AI produces a proof, and a human reviewer asks for clarification on a technical point, and the AI then elaborates to make the argument more rigorous, is the result considered autonomous? This sort of interaction happens all the time in human peer review. We think the answer could be “yes”, at least if the full transcript of the interaction is provided and observers agree that the human input does not contain mathematical ideas or content. On the other hand, for research problems at the caliber of FirstProof, expertise is already required to identify possible weak points to ask about, so such an interaction cannot occur without an expert in the loop. Another question was whether human expertise can be used to select the best solution out of a number of attempts. Under our reading of the rules, this does not seem to be disallowed. But it offers a potentially huge performance advantage, which seems orthogonal to the evaluation of AI capability. Our approach to the challenge guaranteed autonomy in the strictest sense: for the generation of our solutions, there was absolutely no human intervention. Humans experts inspected the final output of this pipeline for evaluation purposes only, without altering any content. We ran two different agents and designated one “preferred solution” per problem, whose ratings are displayed in Table 1. This designation admittedly draws upon our own expertise. Correctness. We interpreted “Correct” as meaning “publishable after minor revisions, within the established range of the peer review process”, consistent with the standards222https://icarm.zulipchat.com/#narrow/channel/568090-first-proof/topic/Mathematical.20standard/near/573992500 voiced by the FirstProof authors. In particular, we do not claim that our solutions are publication-ready as originally generated. Many fail to meet the stated requirement that “Citations should include precise statement numbers and should either be to articles published in peer-reviewed journals or to arXiv preprints”, but do meet the citation standards prevailing in the literature. We emphasize that this is only our own interpretation of the challenge. Other reasonable interpretations exist, and the authors of FirstProof make clear in [abouzaid2026proof] that it is not intended as a formal benchmark. 3 Methodology and results We prompted the agent Aletheia from [feng2026autonomousmathematicsresearch] with the problem statements from the FirstProof LaTeX file, copy-pasted without any modification. The outputs of Aletheia were filtered, without any intermediate alteration, through a pre-determined verification and extraction prompt (exposed in §A) designed to the stated standards of the FirstProof authors to produce “a proof that conforms to the levels of rigor and scholarship prevailing in the mathematics literature.” Moreover, the verification and extraction prompt elicited LaTeX code directly as output, ensuring that manual intervention would not be required even for reformatting the response in a LaTeX document. We then tried to judge the outputs of this pipeline, in some cases asking for help among our colleagues. In this process, we did not interact with the model at all–not even by prompting for clarification or elaboration on points we did not understand. Our overall pipeline is illustrated below. For internal permissions reasons, we were not able to publicly release our results before official solutions were uploaded by the FirstProof authors on February 13, 11:59pm PST. In order to certify that our results were obtained without data contamination from these solutions, we e-mailed our solutions privately to the FirstProof authors at 11:07pm PST on February 13 (along with a preliminary version of this document including Table 3, which represented our initial estimate of the correctness of the solutions at that point). We later shared333https://icarm.zulipchat.com/#narrow/channel/568090-first-proof/topic/Aletheia’s.20solutions our solutions publicly on February 18, 9:27am PST and Mohammed Abouzaid (lead FirstProof author) confirmed, in the same thread, the existence of our solutions before the deadline.444Regrettably, there was one typo in our submission: the file labeled FP10_A.pdf was instead for Aletheia B and should have been named FP10_B.pdf; the submission for Aletheia A on FP#10 was omitted, and is now included as FP10_A.pdf. 3.1 Aletheia (Best of 2) We ran the agent Aletheia from [feng2026autonomousmathematicsresearch] on two different base models. These will be designated as follows: 1. Aletheia A: with the same base model as Gemini 3 Deep Think [gemini3deepthink2026] as of February 2026. 2. Aletheia B: with the January 2026 base model of Gemini, referenced in [feng2026autonomousmathematicsresearch]. Aletheia A Aletheia B Zulip P1 No output No output P2 Correct Correct Link P3 No output No output P4 No output No output P5 Correct Misinterpreted Link P6 No output No output P7 Critically Flawed Correct Link P8 Inadequate Correct? Link P9 Correct Correct Link P10 Correct Correct Link Table 2: Our current (post-deadline) estimation of the results based on the consensus of expert assessments. On P8, the expert assessment was not unanimous. We include links with public comments (on Zulip) for individual problems. On the 10 FirstProof problems, our agents produced solution candidates to 6 problems (P2, P5, P7, P8, P9, P10). From a best-of-2 evaluation, the majority opinion of expert evaluations indicated that all 6 problems were solved correctly (under the interpretation of needing only minor revisions), although the assessments on P8 were not unanimous: only 5 out of 7 experts rated it Correct. The assessment of individual solutions is displayed in Table 2. Section 3.2 discusses the evaluations in more detail. For the other 4 problems (P1, P3, P4, P6) both of our agents returned no solution: either by explicitly outputting “No solution found”, or by not returning any output within the time limit. This self-filtering feature was one of the key design principles of Aletheia; we view reliability as the primary bottleneck to scaling up AI assistance on research mathematics. We suspect that, given the limited bandwidth for human expert verification, many practicing researchers would prefer to trade raw problem-solving capability for increased accuracy.555This was our motivation for building Aletheia, and indeed the origin of the name. Inference cost. The inference-time computation expended by Aletheia on the FirstProof problems can be interpreted as a rough proxy of the problem difficulty from the agent’s perspective. In Figure 1, we display the inference cost of each candidate solution as a multiple of the inference cost of the solution to Erdős-1051 from (Feng et al., 2026a). Both base models used here are different from the one used in (Feng et al., 2026a), so the comparison is not on equal footing, but it gives some indication. For each problem, the inference cost exceeded that of Erdős-1051. For P7 in particular, the inference cost exceeded previously observed scales by an order of magnitude, both because the Generator subagent took much more computation to produce a candidate solution, and because more interactions were required to pass the Verifier subagent. We note that while most of the FirstProof problems were described as Lemmas arising in the recent research of the authors, P7 was advertised as an open problem in the book of Weinberger [Wein23], prior to its resolution by Cappell–Weinberger–Yan (not published until the FirstProof solutions). Figure 1: Plot of the inference cost per FirstProof problem, as a multiple of the inference cost of the solution to Erdős-1051 from [feng2026semiautonomousmathematicsdiscoverygemini]. Not all of the problems required a large inference budget to solve. Aryan Mokhtari and David Woodruff succeeded in manually orchestrating the publicly available Gemini 3 Deep Think model to solve Problem 10, as described in Appendix C.7. 3.2 Evaluations To evaluate our outputs, we obtained independent feedback from at least two academic mathematicians (some of whom were partially affiliated with Google) for each problem. When the experts felt less confident, we solicited more opinions from academic mathematicians. Table 2 summarizes our assessments. A problem-by-problem description is given below. P2. Four out of four experts agreed that both solutions were Correct. P5. Experts pointed out that there was ambiguity in the formulation of the question. Four out of four experts agreed that Aletheia A’s solution is Correct. Aletheia B interpreted the “slice filtration” in an archaic way that differs from its modern usage. Because of this, reviewers classified Aletheia B’s solution as a Misinterpretation of the problem, and did not further vet it for mathematical correctness. P7. Three out of three experts agreed that Aletheia B’s solution is Correct. Aletheia A’s solution is Critically Flawed. It contains two arguments, both of which boil down to the claim that if σ is an order 2 automorphism acting freely on a manifold M, then the (compactly supported) rational Euler characteristic of M is divisible by 22. The attempted justification invokes multiplicativity of (compactly supported) rational Euler characteristic, but this is not justified without appropriate finiteness assumptions on M; this fallacy is noted in the official problem comments. P8. Experts deemed Aletheia A’s solution to P8 to be Inadequate. For Aletheia B’s solution to P8, three out of three external specialists in symplectic geometry judged it to be correct prior to the February 13 deadline. An internal mathematician expressed reservations, so we solicited more assessments, ultimately obtaining opinions from four specialists in symplectic geometry and three additional mathematicians with adjacent expertise. In total, three specialists and two adjacent mathematicians considered the solution to be Correct. A representative quote from this group was, “Overall, while I wouldn’t say this solution is perfect, I think it’s reasonable to count it as a correct proof.” The remaining specialist and adjacent mathematician considered the proof to be incomplete due to the level of detail. A representative quote from this group was, “The shakiest part is indeed in the interpolation step when the local smoothings at the vertices of the polyhedral Lagrangian surface need to be extended to smoothings along the edges. I think it is fair to object that more detail is needed at this step, and this is true for the proof attempts provided by both agents.” Upon examining the expert evaluations, we realized that all were essentially in agreement on the mathematical content, and the ambiguity came from subjective interpretation of whether the missing detail exceeded the threshold of “minor revisions”. None of the experts expressed that there were errors in the argument, but most experts voiced that parts of Steps 3 and 4 were vague or sketchy (see §3.2), and that the solution as a whole was not publishable without revisions. P9. Four out of four experts agreed that Aletheia A’s solution is correct. Two out of two experts agreed that Aletheia B’s solutions are correct. P10. Two out of two experts agreed that both Aletheia A’s and Aletheia B’s solutions are correct. 3.3 Further comparisons Aletheia A and Aletheia B each produced candidate solutions for the same six problems. Each agent individually had at least one false positive, but their best-of-2 performance produced credible solutions to all six problems. This outcome shows a promising increase in accuracy over the December 2025 version of Aletheia used for the Erdős problems in [feng2026semiautonomousmathematicsdiscoverygemini]. Compared to that version, Aletheia A and Aletheia B featured improvements to both the agentic scaffolding and the base models. In addition to Aletheia, an independent evaluation of the publicly available Gemini 3 Deep Think model highlighted its strong capabilities. While not strictly autonomous—relying on two humans to sample and concatenate the best outputs —this effort produced a solution to Problem 10 that matches the optimal theoretical complexity bound also discovered autonomously by Aletheia A, but with much less inference scaling; see Appendix C.7. 4 Acknowledgments We thank Daniel Alvarez-Gavela, Otis Chodosh, Vincent Cohen-Addad, Laurent Cote, Jim Davis, Alex Davies, Jim Fowler, Javier Gomez-Serrano, Bogdan Georgiev, Vineet Gupta, Euiwoong Lee, Gilad Lerman, Yaguang Li, Hanzhao (Maggie) Lin, Daniel Litt, Chi-Heng Lo, Aranyak Mehta, Mona Merling, Daniel Miao, Agustin Moreno, Danny Xiaolin Shi, George Tsoukalas, Allen Yuan, Yufei Zhao, Daniel Zheng, and Goran Zuzic for help. We are grateful to the Institute for Computer-Aided Reasoning in Mathematics under NSF grant DMS 2425401 for hosting online discussion of the FirstProof results. Thanks to Benoit Schillings, Koray Kavukcuoglu, Demis Hassabis, and Sergey Brin for support and for encouraging us to tackle harder problems. References Appendix A Verification and Extraction Prompt Below we display the verification and extraction prompt used on Aletheia’s outputs, which were run through Gemini 3 Deep Think. This prompt was designed elicit output of the quality and format requested by the FirstProof authors. In particular, it allowed us to obtain LaTeX code directly as output, ensuring that manual intervention would not be required even for reformatting the response in a LaTeX document. Running this prompt filtered out a P3 submission from Aletheia B with verdict [WRONG]. A [FIXABLE] verdict was returned on P5 and P7 from Aletheia A, and our logs display the (autonomously) revised outputs. Other outputs listed above were marked [CORRECT] by the extraction prompt, and no changes were made to produce the final output. ⬇ You are an expert peer reviewer for a top-tier academic journal. Your task is to rigorously evaluate a problem and its candidate solution. If you find a correct solution, output it as a latex document that conforms to the levels of rigor and scholarship prevailing in the mathematics literature. Please approach the evaluation using the following structured process: **1. Independent Verification** Before evaluating the candidate, use your reasoning process to independently analyze the ‘<problem>‘ to determine the correct methodology and potential edge cases. Then, do a line-by-line verification of the ‘<candidate_solution>‘. Actively search for logical fallacies, unstated assumptions, calculation errors, or lack of rigor. After your reasoning process, format your final response exactly as follows: ### 1. Critique Provide a concise summary of your analysis. Point out any specific flaws, leaps in logic, or informalities found in the candidate solution. The solution needs to conform to the levels of rigor and scholarship prevailing in the mathematics literature. If the solution cites the literature, carefully check that all citations include precise statement numbers and should either be to articles published in peer-reviewed journals or to arXiv preprints. ### 2. Verdict Based on your critique, declare exactly ONE of the following verdicts in bold: - **[CORRECT]**: The solution is flawless, completely rigorous, and requires no changes. - **[WRONG]**: The solution is fundamentally flawed, relies on invalid logic, or cannot be salvaged without a complete rewrite of the core approach. - **[FIXABLE]**: The core approach is sound, but it contains minor errors, skips necessary steps, or lacks formal academic rigor. ### 3. Resolution Execute the corresponding action based on your verdict: - If **[CORRECT]**: Briefly state why the solution meets publication standards. - If **[WRONG]**: Explicitly detail the fatal flaw in the approach and mathematically/logically explain why it fails. (Do not write a new solution from scratch). - If **[FIXABLE]**: Generate a **complete, corrected version** of the solution from start to finish. Do not merely list the fixes. The revision must be a cohesive, standalone proof/solution written at a level of completeness, clarity, and rigor suitable for peer-reviewed journal publication, conforming to the levels of rigor and scholarship prevailing in the mathematics literature. If the solution cites the literature, carefully check that all citations include precise statement numbers and should either be to articles published in peer-reviewed journals or to arXiv preprints. <problem> [INSERT PROBLEM HERE] </problem> <candidate_solution> [INSERT CANDIDATE SOLUTION HERE] </candidate_solution> Appendix B Pre-deadline evaluations This Appendix records the “best-of-2” submission for each problem that was sent to the FirstProof authors on February 13, 2026. Originally, we ran another agent called Aletheia Af, a variant setting of Aletheia that overrode the natural orchestration to force greater inference expenditure during generation. Aletheia Af was aborted shortly after producing solutions to P2 and P9 to save inference cost. To preserve the best-of-2 nature of our attempt, we did not run P2, P9 (or P5) on Aletheia B until the evening of February 13, at which point we ran Aletheia B on those problems for future ablation purposes only (without reading the output). Table 3 is reproduced exactly from the February 13 e-mail sent to the FirstProof authors. It displays the internal evaluations of the solutions as of February 13, 2026, and a “first choice” submission for each problem. The accuracy of these evaluations is superseded by Table 2, which is based on more careful evaluations with a wider net of experts; we include Table 3 only for historical reasons. Note, however, that the best-of-2 results from Table 3 and the best-of-2 results from Table 2 both align with Table 1. We discuss the differences between Table 3 and Table 2. P2. Aletheia B’s submission for P2, left unread before February 14, was later found to be Correct. P5. Aletheia B’s submission for P5, left unread before February 14, was later found to be based on a Misinterpretation of the question. P7. We were initially unable to validate Aletheia B’s solution to P7 due to its late appearance, as well as limited internal expertise. Based on prior experience with solutions of such complexity, we conservatively guessed that it was Incorrect. Later, upon closer examination, we realized that Aletheia B’s solution to P7 was in fact Correct. P8. Prior to February 13, three out of three experts deemed Aletheia A’s submission for P8 to be Correct (based on quick appraisals). Upon closer examination, at least one expert commented that “it is sketchy in some important places (I think it’s fair to say there are some gaps, arguably errors), so does not reach the typical standard of a correct proof ”. Another expert said “actually, maybe [Aletheia A’s solution] is a bit short of correct, but I think it is not far off”. We therefore changed the verdict to Inadequate in Table 2. P9. Aletheia B’s solution to P9, left unread before February 14, was later found to be Correct. P10. Aletheia A’s solution to P10 was labeled Incorrect in Table 3. This turned out to be a miscommunication from one expert to the lead author, and after reassessment experts were unanimous that the original solution was correct. In fact, they considered it to be more optimal than Aletheia B’s solution, as Aletheia A autonomously derived a precomputation step that removes the O(q)O(q) dependency from the iterative PCG loop. While we present Aletheia B’s solution in Appendix C.6 as it was our initial “first choice” submission, the full Aletheia A solution is available online here. Deprecated (pre-deadline) evaluations Aletheia A Aletheia Af Aletheia B P1 N/A N/A N/A P2 Correct Correct ? P3 N/A N/A Filtered out P4 N/A N/A N/A P5 Correct N/A ? P6 N/A N/A N/A P7 Incorrect N/A Incorrect? P8 Correct N/A Correct P9 Correct Correct ? P10 Incorrect N/A Correct Table 3: Our pre-deadline estimation of the results, as sent to the FirstProof authors at 11:07pm PST on February 13. Correct = our first choice solution. Incorrect = we are confident it is incorrect. Filtered out = filtered by the additional verification and extraction prompt. ? = ran for ablation purposes on Friday evening; not read before the deadline. Aletheia A is Aletheia with Gemini 3 Deep Think as base model. Aletheia Af is an extended generation variant of Aletheia A. Aletheia B is Aletheia with base model B, from §2 of [feng2026autonomousmathematicsresearch]. ‘N/A’ indicates either Aletheia returned “No solution found” or failed to return a solution within the time limit. Appendix C Raw prompts and outputs For each FirstProof problem answered by at least one of our two agents, we display the raw prompt and “first choice” output, according to our original evaluation in Table 3, which was as sent to the FirstProof authors prior to the deadline. We also include remarks with selected expert commentary. C.1 Problem 2 Problem C.1. FirstProof # 2 Let F be a non-archimedean local field with ring of integers o. Let NrN_r denote the subgroup of GLr(F)GL_r(F) consisting of upper-triangular unipotent elements. Let ψ:F→ℂ×ψ:F ^× be a nontrivial additive character of conductor o, identified in the standard way with a generic character of NrN_r. Let Π be a generic irreducible admissible representation of GLn+1(F)GL_n+1(F), realized in its ψ−1ψ^-1-Whittaker model (Π,ψ−1)W( ,ψ^-1). Must there exist W∈(Π,ψ−1)W ( ,ψ^-1) with the following property? Let π be a generic irreducible admissible representation of GLn(F)GL_n(F), realized in its ψ-Whittaker model (π,ψ)W(π,ψ). Let q denote the conductor ideal of π, let Q∈F×Q∈ F^× be a generator of −1 q^-1, and set uQ:=In+1+QEn,n+1∈GLn+1(F),u_Q:=I_n+1+Q\,E_n,n+1 _n+1(F), where Ei,jE_i,j is the matrix with a 11 in the (i,j)(i,j)-entry and 0 elsewhere. For some V∈(π,ψ)V (π,ψ), the local Rankin–Selberg integral ∫Nn (F)W(diag(g,1)uQ)V(g)|detg|s−12g _N_n _n(F)W(diag(g,1)u_Q)\,V(g)\,| g|^s- 12\,dg is finite and nonzero for all s∈ℂs . Solution C.2. Model Response (Agent A) Introduction Let F be a non-archimedean local field with ring of integers o and maximal ideal p. We fix a uniformizer ϖ∈ ∈ p and let q=|/|q=| o/ p|. Let NrN_r denote the subgroup of GLr(F)GL_r(F) consisting of upper-triangular unipotent elements, and let Kr=GLr()K_r=GL_r( o) denote the standard maximal compact subgroup. Let ψ:F→ℂ×ψ:F ^× be a fixed nontrivial additive character of conductor o. Theorem C.3. Let Π be a generic irreducible admissible representation of GLn+1(F)GL_n+1(F). There exists W∈(Π,ψ−1)W ( ,ψ^-1) such that for any generic irreducible admissible representation π of GLn(F)GL_n(F) with conductor ideal q, and any generator Q∈F×Q∈ F^× of −1 q^-1, there exists V∈(π,ψ)V (π,ψ) such that the local Rankin–Selberg integral Z(s,W,V)=∫Nn (F)W(diag(g,1)uQ)V(g)|detg|s−12gZ(s,W,V)= _N_n _n(F)W(diag(g,1)u_Q)\,V(g)\,| g|^s- 12\,dg is finite and nonzero for all s∈ℂs , where uQ=In+1+QEn,n+1u_Q=I_n+1+Q\,E_n,n+1. Proof C.4. Step 1: Gelfand–Kazhdan restriction and s-independence. We evaluate the right translation of W by uQu_Q. Block matrix multiplication yields diag(g,1)uQ=UQdiag(g,1),whereUQ=In+1+Q∑i=1ngi,nEi,n+1.diag(g,1)u_Q=U_Qdiag(g,1), U_Q=I_n+1+Q _i=1^ng_i,nE_i,n+1. Because UQ∈Nn+1U_Q∈ N_n+1 and its only superdiagonal entry (i.e., immediately above the main diagonal) is located at (n,n+1)(n,n+1) with value Qgn,nQg_n,n, the left Nn+1N_n+1-equivariance of the Whittaker model (Π,ψ−1)W( ,ψ^-1) entails W(diag(g,1)uQ)=ψ−1(Qgn,n)W(diag(g,1))=ψ(−Qgn,n)W(diag(g,1)).W(diag(g,1)u_Q)=ψ^-1(Qg_n,n)W(diag(g,1))=ψ(-Qg_n,n)W(diag(g,1)). By the Gelfand–Kazhdan restriction theory for the Kirillov model (H. Jacquet, I. I. Piatetski-Shapiro, and J. A. Shalika, Rankin–Selberg Convolutions, 1983), the restriction map W↦W|GLn(F) .W W |_GL_n(F) surjects onto a space of functions containing c∞(Nn (F),ψ−1)C_c^∞(N_n _n(F),ψ^-1). We define a smooth cut-off function Φ∈c∞(Nn (F),ψ−1) _c^∞(N_n _n(F),ψ^-1) supported precisely on the open and closed double coset NnKnN_nK_n by setting Φ(nk)=ψ−1(n) (nk)=ψ^-1(n) for n∈Nnn∈ N_n and k∈Knk∈ K_n, and extending it by zero elsewhere. This is well-defined because ψ is trivial on the intersection Nn∩Kn=Nn∩GLn()N_n∩ K_n=N_n _n( o). We fix a choice of W∈(Π,ψ−1)W ( ,ψ^-1) satisfying W(diag(g,1))=Φ(g)W(diag(g,1))= (g). Substituting this test vector W restricts the domain of integration strictly to the compact quotient Nn Kn≃(Nn∩Kn) _n N_nK_n (N_n∩ K_n) K_n. For k∈Knk∈ K_n, we have |detk|=1| k|=1, which completely eliminates the complex parameter s. Normalizing the quotient measure appropriately, the integral converges absolutely to a finite, s-independent functional: LQ(V)=∫Knψ(−Qkn,n)V(k)k.L_Q(V)= _K_nψ(-Qk_n,n)V(k)\,dk. We are reduced to showing that there exists V∈(π,ψ)V (π,ψ) such that LQ(V)≠0L_Q(V)≠ 0. Step 2: The unramified case (c=0c=0). If π is unramified, its conductor ideal is = q= o, meaning Q∈×Q∈ o^×. We evaluate the functional on the normalized spherical vector V=V0V=V_0, which satisfies V0(k)=1V_0(k)=1 for all k∈Knk∈ K_n. Since kn,n∈k_n,n∈ o and Q∈×Q∈ o^×, we have −Qkn,n∈-Qk_n,n∈ o. Because the additive character ψ has conductor o, it follows that ψ(−Qkn,n)=1ψ(-Qk_n,n)=1. The functional thus yields LQ(V0)=vol(Kn)>0L_Q(V_0)=vol(K_n)>0. Step 3: Finite Fourier analysis setup (c≥1c≥ 1). Assume π has conductor =c q= p^c with c≥1c≥ 1. Here, Q=αϖ−cQ=α ^-c for some unit α∈×α∈ o^×. Let V0∈(π,ψ)V_0 (π,ψ) be the essential newform, properly normalized so that V0(In)=1V_0(I_n)=1. Suppose, for the sake of contradiction, that LQ(π(h−1)V0)=0L_Q(π(h^-1)V_0)=0 for all h∈Knh∈ K_n. Evaluating the functional and making the change of variables k↦khk kh yields: ∫Knψ(−Q(kh)n,n)V0(k)k=0for all h∈Kn. _K_nψ(-Q(kh)_n,n)V_0(k)\,dk=0 all h∈ K_n. Let en=(0,…,0,1)e_n=(0,…,0,1) be viewed as a row vector in n o^n. Then (kh)n,n=enkhenT=(enk)y(kh)_n,n=e_nkhe_n^T=(e_nk)y, where y=henTy=he_n^T is a column vector. As h traverses KnK_n, the vector y traverses all unimodular column vectors in n o^n. Because Q=αϖ−cQ=α ^-c, the value ψ(−Q(enk)y)ψ(-Q(e_nk)y) depends on the row vector enke_nk exclusively modulo c p^c. We descend to the finite quotient module G=(/c)nG=( o/ p^c)^n by defining a function H:G→ℂH:G as follows: H(η)=∫k∈Kn:enk≡η(modc)V0(k)k.H(η)= _\k∈ K_n:e_nk≡η p^c\V_0(k)\,dk. If η does not lift to a unimodular vector in n o^n, the domain of integration is empty, forcing H(η)=0H(η)=0. The vanishing assumption dictates that the finite Fourier transform of H is identically zero on all unimodular vectors y∈Gy∈ G: H^(y)=∑η∈GH(η)ψ(−Qηy)=0. H(y)= _η∈ GH(η)ψ(-Qη y)=0. Step 4: Fourier inversion and translation invariance. Since H^(y)=0 H(y)=0 for all unimodular y, the support of H H is restricted to non-unimodular vectors. Over the finite module G, a vector is non-unimodular if and only if all its entries belong to /c p/ p^c, meaning H H is supported entirely on G pG. Applying the Fourier inversion formula over G, we obtain: H(η)=1|G|∑y∈GH^(y)ψ(Qηy).H(η)= 1|G| _y∈ pG H(y)ψ(Qη y). Let y∈Gy∈ pG, guaranteeing y=ϖzy= z for some column vector z∈(/c−1)nz∈( o/ p^c-1)^n. For an arbitrary shift δ∈c−1Gδ∈ p^c-1G, we may write δ=ϖc−1xδ= ^c-1x with a row vector x∈Gx∈ G. The inner product computes as: Qδy=(αϖ−c)(ϖc−1x)(ϖz)=αxz∈.Qδ y=(α ^-c)( ^c-1x)( z)=α xz∈ o. Because the additive character ψ has conductor o, we deduce ψ(Qδy)=ψ(αxz)=1ψ(Qδ y)=ψ(α xz)=1. The additive character thus neutralizes the shift, giving ψ(Q(η+δ)y)=ψ(Qηy)ψ(Q(η+δ)y)=ψ(Qη y). Consequently, H(η)H(η) exhibits translation invariance: H(η+δ)=H(η)for all δ∈c−1G.H(η+δ)=H(η) all δ∈ p^c-1G. Step 5: Level lowering and contradiction. We evaluate H(en)H(e_n). The domain of integration enforces the condition enk≡en(modc)e_nk≡ e_n p^c, which strictly characterizes the mirabolic congruence subgroup K1(c)K_1( p^c) consisting of matrices in KnK_n whose last row is congruent to ene_n modulo c p^c. By foundational theory (H. Jacquet, I. I. Piatetski-Shapiro, and J. A. Shalika, Conducteur des représentations du groupe linéaire, 1981), the essential newform V0V_0 is invariant under right translation by K1(c)K_1( p^c). Since V0(In)=1V_0(I_n)=1, we obtain: H(en)=∫K1(c)V0(k)k=vol(K1(c))>0.H(e_n)= _K_1( p^c)V_0(k)\,dk=vol(K_1( p^c))>0. By the translation invariance established above, summing H over the qnq^n mutually distinct shifts δ∈c−1Gδ∈ p^c-1G yields: ∑δ∈c−1GH(en+δ)=qnH(en)>0. _δ∈ p^c-1GH(e_n+δ)=q^nH(e_n)>0. Conversely, returning to the definition of H, the disjoint union of the integration domains k∈Kn:enk≡en+δ(modc)\k∈ K_n:e_nk≡ e_n+δ p^c\ systematically aggregates to the coarser condition enk≡en(modc−1)e_nk≡ e_n p^c-1. This aggregated domain precisely identifies the broader mirabolic congruence subgroup K1(c−1)K_1( p^c-1). Therefore: ∑δ∈c−1GH(en+δ)=∫K1(c−1)V0(k)k. _δ∈ p^c-1GH(e_n+δ)= _K_1( p^c-1)V_0(k)\,dk. This integral calculates the evaluation at InI_n of the locally averaged vector v=∫K1(c−1)π(k)V0k∈(π,ψ).v= _K_1( p^c-1)π(k)V_0\,dk (π,ψ). Because the conductor of π is exactly c p^c, the representation π contains no nonzero vectors invariant under the larger mirabolic congruence subgroup K1(c−1)K_1( p^c-1). Thus, the vector v identically vanishes, mandating v(In)=0v(I_n)=0. We are thereby led to the contradiction 0=qnvol(K1(c))>00=q^nvol(K_1( p^c))>0. This contradiction demonstrates that the uniform vanishing hypothesis must be false. We conclude that there exists some translate V=π(h−1)V0V=π(h^-1)V_0 for which the local Rankin–Selberg integral is finite and nonzero, completing the proof. Remark C.5. The response’s citation to (H. Jacquet, I. I. Piatetski-Shapiro, and J. A. Shalika, Rankin–Selberg Convolutions, 1983) should be refined to specifically (2.2) of that paper. The response’s citation to (H. Jacquet, I. I. Piatetski-Shapiro, and J. A. Shalika, Conducteur des représentations du groupe linéaire, 1981) should be refined to specifically Théorème (5.1) of that paper. Other than these minor points, the solution is flawless. C.2 Problem 5 Problem C.6. FirstProof # 5 Fix a finite group G. Let O O denote an incomplete transfer system associated to an N∞N_∞ operad. Define the slice filtration on the G-equivariant stable category adapted to O O and state and prove a characterization of the O O-slice connectivity of a connective G-spectrum in terms of the geometric fixed points. Solution C.7. Model Response (Agent A) Setup and Structural Invariants In equivariant stable homotopy theory, commutative ring spectra can be parameterized by N∞N_∞ operads, which specify the sets of admissible norm maps. By the foundational work of Blumberg and Hill (2, Section 4), and its subsequent combinatorial classification by Rubin (5, Theorem 3.7) via indexing systems, the data of an N∞N_∞ operad on a finite group G can be equivalently captured by a partial order formalism known as an incomplete transfer system. This formulation was explicitly introduced and formalized by Balchin, Barnes, and Roitzheim (1, Definition 2.4). Definition C.8 (Balchin, Barnes, and Roitzheim (1, Definition 2.4)). A transfer system O on a finite group G is a partial order ⊆ _O on the set of subgroups of G that refines inclusion and satisfies two axioms: 1. Conjugation: K⊆H⟹gKg−1⊆gHg−1K _OH gKg^-1 _OgHg^-1 for all g∈Gg∈ G. 2. Restriction: If K⊆HK _OH and J≤HJ≤ H, then K∩J⊆JK∩ J _OJ. Because the set of subgroups K≤H∣K⊆H\K≤ H K _OH\ is finite and closed under intersection (via the restriction axiom and the transitivity of the partial order), it possesses a unique minimal element, which we denote by H_O. This allows us to define a natural index for subgroups adapted to the operad. Definition C.9. The O-index of a subgroup J≤GJ≤ G is defined as the maximal index of an O-admissible subgroup of J, which evaluates to: ∥J∥:=[J:J].\|J\|_O:=[J:J_O]. Definition C.10. A finite H-set T is O-admissible if the stabilizer of every point t∈Tt∈ T is an O-admissible subgroup of H (i.e., StabH(t)⊆HStab_H(t) _OH). A permutation representation is O-admissible if it is isomorphic to ℝ[T]R[T] for an O-admissible H-set T. Let RO+(H)RO_O^+(H) denote the monoid of isomorphism classes of O-admissible permutation representations of H. We adapt the regular slice filtration (cf. Hill, Hopkins, and Ravenel (3, Section 4.1); Hill and Yarnall (4, Section 2)) to the incomplete transfer system O as follows: Definition C.11. For an integer n≥0n≥ 0, the O-slice category Σ≥n _≥ n^O is the full subcategory of connective genuine G-spectra generated (under arbitrary wedges, extensions, and homotopy colimits) by the O-slice cells: G+∧HSV|H≤G,V∈RO+(H), and dimℝ(V)≥n. \G_+ _HS^V\; |\;H≤ G,\,V∈ RO_O^+(H), and _R(V)≥ n \. The Main Theorem We generalize the characterization of slice connectivity from Hill and Yarnall (4, Theorem 2.5), providing a sharp equivalence between the O-slice filtration and the connectivity of geometric fixed points. Theorem C.12. Let O be an incomplete transfer system on a finite group G, and let n≥0n≥ 0. A connective G-spectrum X belongs to the O-slice category Σ≥n _≥ n^O if and only if for every subgroup J≤GJ≤ G, the geometric fixed point spectrum ΦJ(X) ^J(X) is ⌈n/‖J‖⌉ n/\|J\|_O -connective (i.e., it belongs to the non-equivariant category Sp≥⌈n/‖J‖⌉Sp_≥ n/\|J\|_O ). A Combinatorial Lemma We first establish a strict lower bound on the fixed-point dimensions of O-admissible representations. Lemma C.13. For any H≤GH≤ G, V∈RO+(H)V∈ RO_O^+(H), and J≤HJ≤ H, the dimension of the J-fixed points satisfies dim(VJ)≥dim(V)‖J‖. (V^J)≥ (V)\|J\|_O. Proof C.14. By additivity over disjoint unions of H-orbits, it suffices to prove this for transitive admissible representations V=ℝ[H/K]V=R[H/K] where K⊆HK _OH. The dimension dim(VJ) (V^J) is precisely the number of J-orbits on the coset space H/KH/K, which corresponds to the number of double cosets |J /K||J H/K|. Consider a generic orbit corresponding to the double coset JxKJxK. The stabilizer in J of the coset xK∈H/KxK∈ H/K is L=J∩xKx−1L=J∩ xKx^-1. By the conjugation axiom, xKx−1⊆xHx−1=HxKx^-1 _OxHx^-1=H. By the restriction axiom applied to J≤HJ≤ H, we obtain L⊆JL _OJ. Because L is O-admissible in J, its index satisfies [J:L]≤[J:J]=∥J∥[J:L]≤[J:J_O]=\|J\|_O. The size of this generic J-orbit on H/KH/K is [J:L][J:L], which is bounded above by ‖J‖\|J\|_O. Partitioning the elements of H/KH/K into these orbits yields: dim(V)=[H:K]=∑orbits[J:L]≤∑orbits∥J∥=dim(VJ)⋅∥J∥. (V)=[H:K]= _orbits[J:L]≤ _orbits\|J\|_O= (V^J)·\|J\|_O. Dividing by ‖J‖\|J\|_O yields the desired inequality. Proof of Necessity Assume X∈Σ≥nX∈ _≥ n^O. Since the geometric fixed point functor ΦJ ^J is exact and preserves arbitrary wedges and homotopy colimits, it suffices to verify the connectivity condition on the generators Y=G+∧HSVY=G_+ _HS^V with dimℝ(V)≥n _R(V)≥ n. By the geometric double coset Mackey formula: ΦJ(Y)≃ΦJ(G+∧HSV)≃⋁x∈J /H,J≤xHx−1S(xV)J. ^J(Y) ^J(G_+ _HS^V) _x∈ J G/H,\;J≤ xHx^-1S^(xV)^J. For each double coset x contributing to the wedge, define J′=x−1Jx≤HJ =x^-1Jx≤ H. The space (xV)J(xV)^J is naturally isomorphic to VJ′V^J . By Lemma C.13, we have dim(VJ′)≥dim(V)/‖J′‖ (V^J )≥ (V)/\|J \|_O. Because the transfer system O is conjugation-invariant, conjugation by x induces a poset isomorphism between the O-admissible subgroups of J′J and those of J, giving ‖J′‖=‖J‖\|J \|_O=\|J\|_O. Thus, dim(VJ′)≥n/‖J‖ (V^J )≥ n/\|J\|_O. Because dimensions of real representations are integers, we obtain the bound dim(VJ′)≥⌈n/‖J‖⌉ (V^J )≥ n/\|J\|_O . Therefore, ΦJ(Y) ^J(Y) is a wedge of non-equivariant spheres of dimension at least ⌈n/‖J‖⌉ n/\|J\|_O , implying ΦJ(Y)∈Sp≥⌈n/‖J‖⌉ ^J(Y) _≥ n/\|J\|_O . Because the subcategory Sp≥⌈n/‖J‖⌉Sp_≥ n/\|J\|_O is closed under wedges, extensions, and homotopy colimits, and ΦJ ^J preserves these operations, this connectivity bound necessarily extends from the generators Y to the generic spectrum X. This completes the proof of necessity. Proof of Sufficiency We proceed by strong induction on the order of G. The base case G=eG=\e\ is trivial. Assume the theorem holds for all proper subgroups of G. Let X be a G-spectrum satisfying the fixed-point bounds for all J≤GJ≤ G. Let P denote the family of proper subgroups of G. Consider the G-isotropy separation cofiber sequence: E+∧X→X→E~∧X.EP_+ X→ X→ EP X. Since the subcategory Σ≥n _≥ n^O is closed under extensions, it suffices to show that both outer terms belong to Σ≥n _≥ n^O. Step 1: The term E+∧XEP_+ X The classifying space EEP is a G-CW complex, and thus E+EP_+ is equipped with a skeletal filtration where the cofibers of the successive skeletal inclusions E+(k−1)→E+(k)EP_+^(k-1)→ EP_+^(k) are finite wedges of cells of the form (G/H)+∧Sk(G/H)_+ S^k for proper subgroups H∈H and k≥0k≥ 0. Smashing this filtration with X, we deduce that E+∧XEP_+ X is built via wedges, extensions, and homotopy colimits from spectra of the form (G/H)+∧Sk∧X≃Σk(G+∧HiH∗X)(G/H)_+ S^k X ^k(G_+ _Hi_H^*X). Because Σ≥n _≥ n^O is closed under homotopy colimits, it is closed under suspensions (as ΣZ Z is the homotopy colimit of ∗←Z→∗ ← Z→ ). Establishing that the unsuspended spectrum G+∧HiH∗X∈Σ≥nG_+ _Hi_H^*X∈ _≥ n^O is strictly sufficient to guarantee that E+∧X∈Σ≥nEP_+ X∈ _≥ n^O. For any proper subgroup H<GH<G, let HO_H denote the transfer system restricted to subgroups of H. For any J≤HJ≤ H, we note ΦJ(iH∗X)≃ΦJ(X) ^J(i_H^*X) ^J(X). By hypothesis, this spectrum is ⌈n/‖J‖⌉ n/\|J\|_O -connective. Because the minimal admissible subgroups in HO_H structurally coincide with those in O, we have ‖J‖H=‖J‖\|J\|_O_H=\|J\|_O. Thus, iH∗Xi_H^*X perfectly satisfies the connectivity hypothesis for HO_H. By the inductive hypothesis, iH∗X∈Σ≥nHi_H^*X∈ _≥ n^O_H. The exact induction functor G+∧H(−)G_+ _H(-) sends HO_H-admissible cells identically to O-admissible cells. Specifically, for any K≤HK≤ H and any HO_H-admissible representation W of K, we have G+∧H(H+∧KSW)≃G+∧KSWG_+ _H(H_+ _KS^W) G_+ _KS^W. Because W is HO_H-admissible, its stabilizers are HO_H-admissible in K, which natively implies they are O-admissible. Therefore, G+∧HiH∗X∈Σ≥nG_+ _Hi_H^*X∈ _≥ n^O, which guarantees E+∧X∈Σ≥nEP_+ X∈ _≥ n^O. Step 2: The term E~∧X EP X By standard geometric localization (see, e.g., (4, Lemma 2.2) or (3, Section 2.5)), E~∧X EP X is a geometric G-spectrum naturally determined by its geometric G-fixed points, yielding the equivalence E~∧X≃E~∧infl(ΦGX) EP X EP ( ^GX), where inflinfl denotes inflation from non-equivariant spectra. By hypothesis, ΦGX∈Sp≥m ^GX _≥ m, where m=⌈n/‖G‖⌉m= n/\|G\|_O . Consequently, ΦGX ^GX is generated (under wedges, extensions, and homotopy colimits) by non-equivariant spheres SkS^k for k≥mk≥ m. Because these operations commute with inflation and smashing with E~ EP, it suffices to prove that E~∧infl(Sk)≃E~∧Sk∈Σ≥n EP (S^k) EP S^k∈ _≥ n^O for all integers k≥mk≥ m. Consider the regular admissible permutation representation V=kℝ[G/G]V=kR[G/G_O]. Its dimension is k[G:G]=k∥G∥≥m∥G∥≥nk[G:G_O]=k\|G\|_O≥ m\|G\|_O≥ n. Consequently, the representation sphere SV∈Σ≥nS^V∈ _≥ n^O. We apply the isotropy separation sequence to SVS^V: E+∧SV→SV→E~∧SV.EP_+ S^V→ S^V→ EP S^V. Observe that for any J≤GJ≤ G, ΦJ(SV)≃SVJ ^J(S^V) S^V^J. By Lemma C.13, for any proper subgroup J<GJ<G, we have dim(VJ)≥dim(V)/‖J‖≥n/‖J‖ (V^J)≥ (V)/\|J\|_O≥ n/\|J\|_O. Thus, SVS^V perfectly satisfies the geometric fixed point bounds for all proper subgroups. Applying the exact same induction logic established in Step 1 to the spectrum Y=SVY=S^V, we deduce that iH∗SV∈Σ≥nHi_H^*S^V∈ _≥ n^O_H via the inductive hypothesis, ensuring E+∧SV∈Σ≥nEP_+ S^V∈ _≥ n^O. As the subcategory Σ≥n _≥ n^O is closed under homotopy colimits (and thus cofibers), we deduce from the sequence that E~∧SV∈Σ≥n EP S^V∈ _≥ n^O. Finally, we identify the G-fixed points VGV^G. Because G acts transitively on the single orbit G/G/G_O, the G-fixed point subspace (the trivial subrepresentation) of ℝ[G/G]R[G/G_O] is 11-dimensional. Thus, dim(VG)=k⋅1=k (V^G)=k· 1=k. Passing to the E~ EP-localization evaluates exactly to these fixed points: E~∧SV≃E~∧infl(ΦGSV)≃E~∧SVG≃E~∧Sk. EP S^V EP ( ^GS^V) EP S^V^G EP S^k. This formally establishes E~∧Sk∈Σ≥n EP S^k∈ _≥ n^O. By generation, E~∧X∈Σ≥n EP X∈ _≥ n^O, closing the induction loop. References Balchin et al. (2021) Scott Balchin, David Barnes, and Constanze Roitzheim. N∞N_∞-operads and associahedra. Pacific Journal of Mathematics, 315(2):285–304, 2021. Blumberg and Hill (2015) Andrew J. Blumberg and Michael A. Hill. Operadic multiplications in equivariant spectra, norms, and transfers. Advances in Mathematics, 285:658–708, 2015. Hill et al. (2016) Michael A. Hill, Michael J. Hopkins, and Douglas C. Ravenel. On the nonexistence of elements of Kervaire invariant one. Annals of Mathematics, 184(1):1–262, 2016. Hill and Yarnall (2018) Michael A. Hill and Carolyn Yarnall. A new formulation of the equivariant slice filtration with applications to CpC_p-slices. Proceedings of the American Mathematical Society, 146(8):3605–3614, 2018. Rubin (2020) Jonathan Rubin. Combinatorial N∞N_∞ operads. Algebraic & Geometric Topology, 20(7):3563–3587, 2020. C.3 Problem 7 Problem C.15. FirstProof # 7 Suppose that Γ is a uniform lattice in a real semi-simple group, and that Γ contains some 2-torsion. Is it possible for Γ to be the fundamental group of a compact manifold without boundary whose universal cover is acyclic over the rational numbers ℚQ? Solution C.16. Model Response (Agent B) Theorem. Let G be a real semi-simple Lie group, and let Γ⊂G ⊂ G be a uniform lattice containing an element of order 22. Then Γ cannot be the fundamental group of a compact manifold without boundary whose universal cover is acyclic over the rational numbers ℚQ. Proof C.17. The proof proceeds by contradiction. Assume there exists a compact, boundaryless manifold M with fundamental group π1(M)≅Γ _1(M) whose universal cover M~ M is rationally acyclic. Let K be a maximal compact subgroup of G, and let X=G/KX=G/K be the associated symmetric space. As a symmetric space of non-compact type, X is a contractible, proper CAT(0)CAT(0) metric space. Let d=dimXd= X. By hypothesis, Γ contains an element γ of order 22. Step 1: Topological Setup and Equivariant Classifying Map By Selberg’s Lemma, the finitely generated linear group Γ contains a torsion-free normal subgroup of finite index, say Γ1 _1. To ensure orientability and connectedness, we refine this subgroup. Let G0G^0 be the connected identity component of G. Let ΓX+⊂Γ _X^+⊂ be the subgroup acting by orientation-preserving isometries on X, and let ΓM+⊂Γ _M^+⊂ be the subgroup acting by orientation-preserving deck transformations on M~ M. Because orientations admit exactly two states, these subgroups have index at most 22 in Γ . We define Γ0=Γ1∩G0∩ΓX+∩ΓM+. _0= _1∩ G^0∩ _X^+∩ _M^+. As a finite intersection of finite-index normal subgroups, Γ0 _0 is a torsion-free normal subgroup of Γ of finite index. Crucially, Γ0⊂G0 _0⊂ G^0, and it acts freely and orientation-preservingly on both M~ M and X. The quotient spaces M0=M~/Γ0M_0= M/ _0 and X0=X/Γ0X_0=X/ _0 are closed, orientable manifolds. Because X is contractible and the Γ0 _0-action is free and cocompact, X0X_0 natively serves as a compact Eilenberg–MacLane classifying space BΓ0B _0. To rigorously construct a classifying map that is strictly pointwise equivariant, we apply Bredon equivariant obstruction theory on the universal covers. The full group Γ acts strictly freely on M~ M via deck transformations, making M~ M a free Γ -CW complex. Furthermore, X is a contractible proper Γ -space. The geometric obstructions to constructing a Γ -equivariant map reside in the Bredon equivariant cohomology groups HΓk(M~;πk−1(X))H^k_ ( M; _k-1(X)). Since X is contractible, πk−1(X)=0 _k-1(X)=0 for all k≥1k≥ 1, meaning all obstructions identically vanish. Thus, there exists a strictly Γ -equivariant continuous map f~:M~→X f: M→ X. Descending this map to the Γ0 _0-quotients yields a canonical classifying map f0:M0→X0f_0:M_0→ X_0, which is strictly Γ/Γ0 / _0-equivariant by geometric construction. Because both M~ M and X are ℚQ-acyclic, the Cartan–Leray spectral sequence collapses, guaranteeing that f0f_0 induces an isomorphism on rational homology. Consequently, dimM0=dimX0=d M_0= X_0=d, and its proper topological mapping degree D=deg(f0)D= (f_0) is a strictly non-zero integer. Because Γ0 _0 is a normal subgroup, the order-22 element γ∉Γ0γ∉ _0 projects to a non-trivial involution γ¯∈Γ/Γ0 γ∈ / _0 acting on both M0M_0 and X0X_0. Let ϵM,ϵX∈±1 _M, _X∈\± 1\ denote the orientation parity of γ¯ γ on M0M_0 and X0X_0, respectively. Because f0f_0 is strictly ℤ/2Z/2-equivariant with respect to γ¯ γ (i.e., f0∘γ¯=γ¯∘f0f_0 γ= γ f_0), evaluating the induced homology maps on the fundamental class [M0]∈Hd(M0;ℤ)[M_0]∈ H_d(M_0;Z) yields: f0∗(γ¯∗[M0])=f0∗(ϵM[M0])=ϵMD[X0],f_0*( γ_*[M_0])=f_0*( _M[M_0])= _MD[X_0], γ¯∗(f0∗[M0])=γ¯∗(D[X0])=ϵXD[X0]. γ_*(f_0*[M_0])= γ_*(D[X_0])= _XD[X_0]. This algebraically mandates ϵMD=ϵXD _MD= _XD. Since D≠0D≠ 0, we immediately obtain ϵM=ϵX _M= _X. Thus, γ¯ γ either preserves the orientation of both manifolds or reverses the orientation of both manifolds. Step 2: The Mapping Degree Parity Constraint via Atiyah–Borel Localization We now establish that the proper mapping degree D must be an even integer. Because X is a complete CAT(0)CAT(0) metric space, Cartan’s Fixed-Point Theorem ensures that the finite group ⟨γ⟩ γ fixes a point in X. This equivariance trivially descends to a fixed point for the involution γ¯ γ on the quotient; thus, the fixed-point set X0γ¯≠∅X_0 γ≠ . Conversely, suppose γ¯ γ fixed a point [y]∈M0[y]∈ M_0. The fixed-point relation would natively lift to γy~=g0y~γ y=g_0 y for some g0∈Γ0g_0∈ _0, where y~∈M~ y∈ M represents a valid chosen lift of [y][y]. The freeness of the Γ -action on M~ M mandates γ=g0∈Γ0γ=g_0∈ _0. Since γ has order 22 and Γ0 _0 is torsion-free, this is mathematically impossible. Thus, M0γ¯=∅M_0 γ= . Assume for contradiction that D is an odd integer. We evaluate ℤ/2Z/2-equivariant Borel cohomology with 2F_2 coefficients. To maintain orientability of the Borel constructions, we select the dimension N of the approximating sphere SNS^N based on the orientation parity ϵX _X: • If ϵX=1 _X=1 (orientation-preserving), we choose N to be an odd integer, ensuring the antipodal map on SNS^N preserves orientation. • If ϵX=−1 _X=-1 (orientation-reversing), we choose N to be an even integer, ensuring the antipodal map on SNS^N reverses orientation. In both cases, the diagonal ℤ/2Z/2-action on the products M0×SNM_0× S^N and X0×SNX_0× S^N strictly preserves orientation. Thus, the Borel quotients MN=M0×ℤ/2SNM_N=M_0×_Z/2S^N and XN=X0×ℤ/2SNX_N=X_0×_Z/2S^N are strictly closed, orientable manifolds. The equivariant map f0f_0 induces a proper fiber bundle map fN:MN→XNf_N:M_N→ X_N of degree D. The ordinary cohomological Gysin transfer unconditionally satisfies (fN)!∘fN∗(x)=(Dmod2)⋅x(f_N)_! f_N^*(x)=(D 2)· x. Because D is odd, D≡1(mod2)D≡ 1 2, meaning the composition acts as the identity on H∗(XN;2)H^*(X_N;F_2). This algebraically forces the pullback fN∗f_N^* to be a split injection. Taking the inverse limit as N→∞N→∞ (over the parity-appropriate sequence of spheres), the true equivariant pullback fℤ/2∗:Hℤ/2∗(X0;2)→Hℤ/2∗(M0;2)f_Z/2^*:H_Z/2^*(X_0;F_2)→ H_Z/2^*(M_0;F_2) is forced to be injective. By the exactness of localization, passing to the localized rings by inverting the polynomial generator u∈H1(Bℤ/2;2)u∈ H^1(BZ/2;F_2) preserves this injectivity: S−1fℤ/2∗:S−1Hℤ/2∗(X0;2)↪S−1Hℤ/2∗(M0;2).S^-1f_Z/2^*:S^-1H_Z/2^*(X_0;F_2) S^-1H_Z/2^*(M_0;F_2). By the Atiyah–Borel Localization Theorem, the localized equivariant cohomology of a space is isomorphic to the localized equivariant cohomology of its fixed-point set: S−1Hℤ/2∗(Y;2)≅H∗(Yγ¯;2)⊗22[u,u−1].S^-1H_Z/2^*(Y;F_2) H^*(Y γ;F_2) _F_2F_2[u,u^-1]. Because X0γ¯≠∅X_0 γ≠ , the localized domain evaluates to a non-zero module. Because M0γ¯=∅M_0 γ= , the localized target is identically zero. An exact injection from a non-zero module into a zero module is impossible. Therefore, D must rigidly be an even integer. Step 3: Higher Signature Rigidity via the Strong Novikov Conjecture We evaluate the symmetric higher signature of M0M_0 within the real C∗C^*-algebra K-theory KOd(Cr∗(Γ0;ℝ))KO_d(C^*_r( _0;R)) to establish a fundamentally conflicting constraint. Because M~ M and X are ℚQ-acyclic, the Universal Coefficient Theorem guarantees they are ℝR-acyclic. Thus, their real cellular chain complexes C∗(M~;ℝ)C_*( M;R) and C∗(X;ℝ)C_*(X;R) constitute finite-length projective free resolutions of the trivial module ℝR over the real group ring ℝΓ0R _0. By the Fundamental Lemma of Homological Algebra, the chain map C∗(f~;ℝ)C_*( f;R) is inherently a strict chain homotopy equivalence over ℝΓ0R _0. The algebraic symmetric Poincaré duality structure of M0M_0 (defined by capping with [M0][M_0]) pushes forward under this chain equivalence to capping with f0∗[M0]=D[X0]f_0*[M_0]=D[X_0]. Thus, the algebraic symmetric Poincaré complex defining the higher signature σ(M0)σ(M_0) is strictly chain-equivalent to the complex of X0X_0 globally scaled by D. Over any real C∗C^*-algebra, scaling a non-degenerate symmetric Poincaré complex by a non-zero real scalar D yields a complex isomorphic to one scaled merely by its sign. Specifically, we can algebraically conjugate the duality structure with the central, self-adjoint, invertible scalar c=1/|D|∈ℝc=1/ |D| . This canonical isomorphism scales the symmetric form by exactly c⋅c∗⋅D=c2⋅D=D/|D|=sgn(D)c· c^*· D=c^2· D=D/|D|=sgn(D). Therefore, the analytic symmetric signatures natively satisfy: σ(M0)=sgn(D)σ(X0)∈KOd(Cr∗(Γ0;ℝ)).σ(M_0)=sgn(D)σ(X_0)∈ KO_d(C^*_r( _0;R)). Because Γ0⊂G0 _0⊂ G^0 is a discrete uniform lattice in a connected Lie group, Kasparov’s foundational theorem (G. Kasparov, “Equivariant K-theory and the Novikov conjecture”, Inventiones Mathematicae 91 (1988), 147–201) establishing the Strong Novikov Conjecture for connected Lie groups guarantees that the rational assembly map μ:⨁kHd−4k(BΓ0;ℚ)→KOd(Cr∗(Γ0;ℝ))⊗ℚμ: _kH_d-4k(B _0;Q)→ KO_d(C^*_r( _0;R)) is injective. The analytic symmetric signature fundamentally corresponds to the assembly of the Poincaré dual of the Hirzebruch L-class. Explicitly incorporating the functorial pushforward of the homology class via the classifying map f0f_0, we have: σ(M0)=μ(f0∗(L(M0)∩[M0]))andσ(X0)=μ(L(X0)∩[X0]).σ(M_0)=μ(f_0*(L(M_0)∩[M_0])) σ(X_0)=μ(L(X_0)∩[X_0]). Because the assembly map μ is rationally injective, the strict equality of K-theoretic signatures forces strict equality of the underlying rationally assembled homology classes in H∗(X0;ℚ)H_*(X_0;Q): f0∗(L(M0)∩[M0])=sgn(D)(L(X0)∩[X0]).f_0*(L(M_0)∩[M_0])=sgn(D)(L(X_0)∩[X_0]). We evaluate this rigid homological equality strictly at the top topological degree d. Because the degree-0 component of the Hirzebruch L-class is identically L0=1∈H0(Y;ℚ)L_0=1∈ H^0(Y;Q), the top-dimensional component of the mixed-degree class L(Y)∩[Y]L(Y)∩[Y] evaluates exactly to the fundamental class [Y]∈Hd(Y;ℚ)[Y]∈ H_d(Y;Q). Restricting the graded equality exclusively to Hd(X0;ℚ)H_d(X_0;Q) yields: f0∗[M0]=sgn(D)[X0].f_0*[M_0]=sgn(D)[X_0]. However, by the geometric definition of the proper mapping degree, f0∗[M0]=D[X0]f_0*[M_0]=D[X_0]. Equating the two algebraic coefficients rigorously enforces: D=sgn(D).D=sgn(D). Because D is a strictly non-zero integer, this analytic rigidity relation exclusively bounds the proper mapping degree to exactly D=1D=1 or D=−1D=-1. Step 4: Final Contradiction In Step 2, the generalized Atiyah–Borel equivariant parity constraint definitively established that the proper mapping degree D must be an even integer to structurally sustain the free ℤ/2Z/2-action without fixed points. Simultaneously, in Step 3, analytic higher signature rigidity (via the Strong Novikov Conjecture) established that D must equal precisely ±1± 1 to preserve the acyclic chain equivalence over the real group C∗C^*-algebra. An integer cannot be simultaneously strictly even and equal to ±1± 1. This terminal geometric and algebraic contradiction mathematically proves that our initial assumption was fundamentally false. Therefore, it is definitively impossible for such a manifold M to exist. Remark C.18. The “Atiyah–Borel Localization Theorem” described by the model appears as Theorem 2.1 of (DW88), and should be credited differently. C.4 Problem 8 Problem C.19. FirstProof # 8A polyhedral Lagrangian surface K in ℝ4R^4 is a finite polyhedral complex all of whose faces are Lagrangians, and which is a topological submanifold of ℝ4R^4. A Lagrangian smoothing of K is a Hamiltonian isotopy KtK_t of smooth Lagrangian submanifolds, parameterised by (0,1](0,1], extending to a topological isotopy, parametrised by [0,1][0,1], with endpoint K0=K_0=K. Let K be a polyhedral Lagrangian surface with the property that exactly 44 faces meet at every vertex. Does K necessarily have a Lagrangian smoothing? Remark C.20. An expert wrote the following (paraphrased) summary of the argument. The general strategy is as follows. In Steps 1 and 2, the solution first performs a local smoothing near the vertices, relying on a nice linear algebra observation. In Step 3, the solution then argues that one can extend this smoothing along the edges. To do this, it makes a choice of linear coordinates (s,y,x2,y2)(s,y,x_2,y_2) near each edge. It then interpolates between the perturbations in this coordinate chart. To perform the interpolation, the agent invokes Lagrangian suspension, which is overkill but fine. In Step 4, the solution is presumably saying that as you send the size of vertex-smoothings to zero, you can correspondingly send the size of the edge perturbations to zero. The explanation for the flux being zero is sketchy to say the least. Solution C.21. Model Response (Agent B) Theorem. Let K⊂ℝ4K ^4 be a polyhedral Lagrangian surface such that exactly four faces meet at every vertex. Then K necessarily admits a Lagrangian smoothing. Proof C.22. The proof relies on the rigid symplectic geometry imposed by the 44-valent condition. We demonstrate that the tangent cone at any non-flat vertex canonically factors into an orthogonal product involving lower-dimensional corners. This algebraic factorization enables the construction of strictly exact (zero-flux) local smoothings at the vertices. We then globally assemble these smoothings by interpolating them along the singular edges using exact Lagrangian suspensions (cobordisms). Because all local modifications are engineered to enclose strictly zero relative symplectic area, the resulting globally smooth surface accumulates identically zero symplectic flux, which rigorously guarantees its extension to a global ambient Hamiltonian isotopy without any topological obstructions. Step 1: Canonical Symplectic Splitting at the Vertices Let v∈Kv∈ K be an arbitrary vertex. Without loss of generality, translate v to the origin. Since exactly four faces meet at v and K is an embedded topological surface, the local tangent cone CvC_v consists of four 22-dimensional planar sectors meeting at the origin in a continuous cycle. Let the outgoing boundary rays of the edges be generated by non-zero tangent vectors r1,r2,r3,r4r_1,r_2,r_3,r_4 in cyclic order. The bounding rays are thus Ri=ℝ≥0riR_i=R_≥ 0r_i, and the faces are modeled by the sectors Fi=span≥0(ri,ri+1)F_i=span_≥ 0(r_i,r_i+1) for i∈1,2,3,4i∈\1,2,3,4\ (indices modulo 44). Because K is a Lagrangian complex, the standard symplectic form ω on ℝ4R^4 vanishes identically on each sector FiF_i. This implies that adjacent boundary tangent vectors are mutually ω-orthogonal: ω(r1,r2)=ω(r2,r3)=ω(r3,r4)=ω(r4,r1)=0.ω(r_1,r_2)=ω(r_2,r_3)=ω(r_3,r_4)=ω(r_4,r_1)=0. Let V=span(r1,r2,r3,r4)V=span(r_1,r_2,r_3,r_4) be the vector space spanned by the tangent cone. We classify the local geometry of CvC_v based on the dimension of V: Case 1: dimV=4 V=4 (Strict Vertex). Define the 22-dimensional planes P13=span(r1,r3)P_13=span(r_1,r_3) and P24=span(r2,r4)P_24=span(r_2,r_4). The plane P13P_13 cannot be isotropic; if it were, r1r_1 and r3r_3 would be mutually ω-orthogonal. Combined with the incidence orthogonality inherited from the faces, r1r_1 would be ω-orthogonal to r1,r2,r3r_1,r_2,r_3, and r4r_4. Since these vectors span all of V=ℝ4V=R^4, r1r_1 would be ω-orthogonal to the entirety of ℝ4R^4. By the non-degeneracy of ω, this forces r1=0r_1=0, a contradiction. Thus, P13P_13 is a strictly symplectic 22-plane. By the incidence relations, every vector in P24P_24 is ω-orthogonal to every vector in P13P_13, meaning P24⊆P13ωP_24 P_13^ω. Since P13P_13 is a symplectic plane, its symplectic orthogonal complement P13ωP_13^ω is also a 22-dimensional symplectic plane. Because dimP24=2 P_24=2 (if the generating vectors were collinear, dimV V would drop to ≤3≤ 3), it follows identically that P24=P13ωP_24=P_13^ω. This yields an orthogonal symplectic direct sum ℝ4=P13⊕P24R^4=P_13 P_24. Geometrically, the tangent cone strictly factors into a Cartesian product of two 11-dimensional corners: Cv=C13×C24⊂P13⊕P24,where C13=R1∪R3 and C24=R2∪R4.C_v=C_13× C_24⊂ P_13 P_24, C_13=R_1∪ R_3 and C_24=R_2∪ R_4. Case 2: dimV=3 V=3 (Crease Vertex). The restriction ω|Vω|_V on the 33-dimensional space V has rank 22 and must therefore possess an exactly 11-dimensional radical L. The four adjacent plane spans Si=span(ri,ri+1)S_i=span(r_i,r_i+1) are maximal isotropic subspaces within the presymplectic space V. Because L is the radical, any maximal isotropic subspace must contain L; thus, L⊂SiL⊂ S_i for all i. Since dimV=3 V=3, the adjacent plane spans cannot all be equal. By cyclic symmetry, we may assume without loss of generality that S1≠S2S_1≠ S_2. Since both are 22-dimensional planes in a 33-dimensional space, their intersection is exactly 11-dimensional. Because L⊂S1L⊂ S_1 and L⊂S2L⊂ S_2, this intersection must be exactly L. However, the shared boundary tangent vector r2r_2 lies in S1∩S2S_1∩ S_2, which strictly forces L=span(r2)L=span(r_2). Because the sector F2F_2 is a valid, non-degenerate 22-dimensional cone, its boundary vectors r2r_2 and r3r_3 are linearly independent. Thus, r3r_3 cannot span L. This immediately implies that S2S_2 and S3S_3 cannot be distinct (otherwise L=span(r3)L=span(r_3) by identical logic). Thus S2=S3S_2=S_3. Similarly, r1r_1 cannot span L, strictly forcing S4=S1S_4=S_1. Therefore, the plane spans coincide in adjacent pairs. Since S1≠S3S_1≠ S_3 (otherwise all generating vectors would be coplanar and dimV=2 V=2), their single intersection S1∩S3S_1∩ S_3 contains both r2r_2 and r4r_4, yielding exactly L=span(r2)=span(r4)L=span(r_2)=span(r_4). Because the rays R2R_2 and R4R_4 bound non-overlapping, valid topological sectors, they must be opposite rays (r4=−cr2r_4=-cr_2 for some c>0c>0) spanning the singular line L. The adjacent sectors merge into two flat half-planes meeting along L. Geometrically, the tangent cone CvC_v factors into a Cartesian product L×C⋔L× C , where C⋔C is a 11-dimensional corner in the 22-dimensional symplectic quotient space V/LV/L. Case 3: dimV=2 V=2 (Flat Vertex). If dimV=2 V=2, V is a 22-dimensional Lagrangian plane (since it is spanned by isotropic sectors). The standard symplectic form ω vanishes identically on V. The four generating tangent vectors lie in V in cyclic order. Because exactly four faces meet at v and K forms a topological surface, the four convex sectors perfectly tile a neighborhood of the origin in V without any gaps or overlaps. Therefore, the tangent cone CvC_v is exactly the completely flat plane V itself, meaning the vertex is inherently smooth and requires no local modification. Step 2: Exact Local Smoothing of the Vertices We define an exact smooth local modification Σv _v for each type of vertex v: Strict vertex (dimV=4 V=4): We resolve the corners C13⊂P13C_13⊂ P_13 and C24⊂P24C_24⊂ P_24 independently. In P13P_13, we select a smooth, embedded 11-dimensional curve γ13 _13 that rounds the corner C13C_13 and strictly coincides with the rays R1,R3R_1,R_3 outside a compact ball of radius R. Crucially, to ensure that the local vertex modifications do not overlap along the edges, we explicitly require R<12minELER< 12 _EL_E, where the minimum is taken over all edge lengths LEL_E in K. We require this smoothing to be exact: the signed symplectic area enclosed between γ13 _13 and C13C_13 is identically zero (achieved by allowing γ13 _13 to smoothly dip slightly outside the sector’s bounds to balance the removed positive area). We symmetrically choose an exact smoothing γ24⊂P24 _24⊂ P_24 under the identical radius bound R. Because P13P_13 and P24P_24 are symplectically orthogonal, their Cartesian product Σv=γ13×γ24 _v= _13× _24 is a smooth, exact Lagrangian surface that locally resolves CvC_v. Crease vertex (dimV=3 V=3): The tangent cone is Cv=L×C⋔C_v=L× C . We choose a smooth, exact 11-dimensional curve γ⋔⊂V/Lγ ⊂ V/L that rounds the corner C⋔C , subject to the strict upper bound on the modification radius R. We define the smoothing as Σv=L×γ⋔ _v=L×γ . Because L is the radical of ω|Vω|_V, Σv _v is an isotropic surface; being 22-dimensional, it is a smooth, exact Lagrangian plane. Flat vertex (dimV=2 V=2): Because Cv=VC_v=V is a smooth plane, we trivially set Σv=V _v=V, which is inherently exact. Step 3: Edge Interpolation via Lagrangian Suspension We now interpolate the exact local vertex smoothings along the edges of K. If the two faces meeting at an edge E are coplanar, the surface is a locally flat plane along E and requires no interpolation. We therefore restrict attention to singular edges E of length LEL_E connecting vertices v0v_0 and v1v_1. The 22-dimensional linear spans of the two non-coplanar flat faces meeting at E, denoted span(FL)span(F_L) and span(FR)span(F_R), define a constant 33-dimensional coisotropic subspace YE=span(FL)+span(FR)Y_E=span(F_L)+span(F_R). Because span(FL)span(F_L) and span(FR)span(F_R) are Lagrangian planes, their symplectic orthogonals satisfy span(FL)ω=span(FL)span(F_L)^ω=span(F_L) and span(FR)ω=span(FR)span(F_R)^ω=span(F_R). Consequently, the symplectic orthogonal complement of YEY_E is exactly YEω=(span(FL)+span(FR))ω=span(FL)∩span(FR)=span(E)Y_E^ω=(span(F_L)+span(F_R))^ω=span(F_L) (F_R)=span(E). The symplectic quotient WE=YE/span(E)W_E=Y_E/span(E) is a 22-dimensional symplectic plane. The geometric projection of the subsets FL∪FRF_L∪ F_R into WEW_E forms a fixed 11-dimensional corner CEC_E. Outside the immediate vertex neighborhoods, the local exact smoothings Σv0 _v_0 and Σv1 _v_1 seamlessly restrict along E to products over transverse curves Γ0,Γ1⊂WE _0, _1⊂ W_E that smooth CEC_E. Because the local models were constructed to be exact, both Γ0 _0 and Γ1 _1 bound identically zero symplectic area with CEC_E, and thus zero algebraic area with each other. By the area-preserving mapping theorem (Moser’s trick) on the plane WEW_E, there exists a compactly supported, time-dependent Hamiltonian Hs:WE→ℝH_s:W_E for s∈[0,LE]s∈[0,L_E] whose exact flow Φs _s smoothly isotopes Γ0 _0 to Γ1 _1 (such that ΦLE(Γ0)=Γ1 _L_E( _0)= _1), with Hs≡0H_s≡ 0 in small neighborhoods of the endpoints s=0s=0 and s=LEs=L_E. We construct the interpolation surface ΣE _E along the edge via an exact Lagrangian suspension. Because E is a straight segment, we can establish global linear Darboux coordinates (s,y,x2,y2)(s,y,x_2,y_2) adapted to E such that s∈[0,LE]s∈[0,L_E] parameterizes the edge E, (x2,y2)(x_2,y_2) are canonical Darboux coordinates for the symplectic slice WEW_E, and y is the conjugate normal momentum. Specifically, the coordinate vector field ∂y _y is strictly ω-orthogonal to WEW_E and normalized so that ω(∂s,∂y)=1ω( _s, _y)=1. The unperturbed coisotropic subspace YEY_E corresponds precisely to the hyperplane y=0\y=0\. In these coordinates, the ambient symplectic form evaluates to ω=ds∧dy+ωWEω=ds dy+ _W_E. We define the suspended surface dynamically: ΣE=(s,−Hs(Φs(q)),Φs(q))|s∈[0,LE],q∈Γ0. _E= \ (s,\,\,-H_s( _s(q)),\,\, _s(q) )\; |\;s∈[0,L_E],\;q∈ _0 \. To verify that ΣE _E is Lagrangian, we pull back the symplectic form via the parameterization map F(s,q)=(s,−Hs(Φs(q)),Φs(q))F(s,q)=(s,-H_s( _s(q)), _s(q)). The differential of the y-coordinate yields dy=−dq(Hs∘Φs)−∂(Hs∘Φs)∂sdsdy=-d_q(H_s _s)- ∂(H_s _s)∂ sds. Wedging with dsds eliminates the purely temporal term: F∗(ds∧dy)=−ds∧dq(Hs∘Φs).F^*(ds dy)=-ds d_q(H_s _s). Evaluating the pullback of ωWE _W_E on tangent vectors ∂s _s and v∈TqΓ0v∈ T_q _0, we apply the defining relation of the Hamiltonian vector field ιXHsωWE=dHs _X_H_s _W_E=dH_s: (F∗ωWE)(∂s,v) (F^* _W_E)( _s,v) =ωWE(∂sΦs,dqΦs(v)) = _W_E( _s _s,d_q _s(v)) =ωWE((XHs)Φs(q),dqΦs(v)) = _W_E((X_H_s)_ _s(q),d_q _s(v)) =(dHs)Φs(q)(dqΦs(v)) =(dH_s)_ _s(q)(d_q _s(v)) =dq(Hs∘Φs)(v) =d_q(H_s _s)(v) Because Γ0 _0 is a 11-dimensional curve, the restriction of ωWE _W_E to Γ0 _0 evaluates to identically zero. The full pullback is thus exactly F∗ωWE=ds∧dq(Hs∘Φs)F^* _W_E=ds d_q(H_s _s). Summing these contributions yields perfect cancellation via the chain rule: F∗ω=−ds∧dq(Hs∘Φs)+ds∧dq(Hs∘Φs)=0.F^*ω=-ds d_q(H_s _s)+ds d_q(H_s _s)=0. Thus, ΣE _E is strictly Lagrangian. Furthermore, because Hs≡0H_s≡ 0 near s=0s=0 and s=LEs=L_E, the normal displacement y=−Hs(Φs(q))y=-H_s( _s(q)) vanishes identically there. This ensures that ΣE _E resides strictly inside YEY_E at its endpoints, flawlessly merging with the exact local planar bounds of the vertex models Σv0 _v_0 and Σv1 _v_1. Step 4: Global Hamiltonian Isotopy By uniformly patching the exact vertex smoothings Σv _v and the exact edge suspensions ΣE _E, we obtain a globally smooth, embedded Lagrangian surface K1K_1. To construct the required continuous topological isotopy KtK_t for t∈(0,1]t∈(0,1] extending continuously to K0=K_0=K, we linearly rescale the exact local modifications. The vertex smoothings uniformly shrink toward the original corners via the spatial scaling tΣvt _v. For the edge interpolations, the scaled transverse curves tΓ0t _0 and tΓ1t _1 are isotoped by the rescaled Hamiltonian Hs(t)(q)=t2Hs(q/t)H_s^(t)(q)=t^2H_s(q/t), generating the exact scaled flow Φs(t)(q)=tΦs(q/t) _s^(t)(q)=t _s(q/t). The normal Darboux displacement within the suspension is given by y=−Hs(t)∘Φs(t)y=-H_s^(t) _s^(t), which scales strictly as (t2)O(t^2). As t→0t→ 0, the transverse smoothing limits uniformly scale as (t)O(t) while the normal y-displacements scale as (t2)O(t^2), ensuring that both strictly vanish in the limit. The continuous family of smooth Lagrangian submanifolds KtK_t (t>0t>0) thereby strictly converges in C0C^0 to the initial topological complex K0=K_0=K. Finally, because every local geometric modification—vertex roundings and edge suspensions—was rigorously constructed as an exact Lagrangian cobordism relative to the unperturbed flat faces, the global symplectic flux is strictly zero. By Weinstein’s Lagrangian Neighborhood Theorem, this exact regular homotopy of smooth Lagrangian embeddings KtK_t lifts to a compactly supported, global ambient Hamiltonian isotopy. Therefore, KtK_t constitutes a genuine Lagrangian smoothing of K. C.5 Problem 9 Problem C.23. FirstProof # 9Let n≥5n≥ 5. Let A(1),…,A(n)∈ℝ3×4A^(1),…,A^(n) ^3× 4 be Zariski-generic. For α,β,γ,δ∈[n]α,β,γ,δ∈[n], construct Q(αβγδ)∈ℝ3×3×3×3Q^(αβγδ) ^3× 3× 3× 3 so that its (i,j,k,ℓ)(i,j,k, ) entry for 1≤i,j,k,ℓ≤31≤ i,j,k, ≤ 3 is given by Qijkℓ(αβγδ)=det[A(α)(i,:);A(β)(j,:);A(γ)(k,:);A(δ)(ℓ,:)]Q^(αβγδ)_ijk = [A^(α)(i,:);A^(β)(j,:);A^(γ)(k,:);A^(δ)( ,:)]. Here A(i,:)A(i,:) denotes the iith row of a matrix A, and semicolon denotes vertical concatenation. We are interested in algebraic relations on the set of tensors Q(αβγδ):α,β,γ,δ∈[n]\Q^(αβγδ):α,β,γ,δ∈[n]\. More precisely, does there exist a polynomial map :ℝ81n4→ℝNF:R^81n^4 ^N that satisfies the following three properties? • The map F does not depend on A(1),…A(n)A^(1),… A^(n). • The degrees of the coordinate functions of F do not depend on n. • Let λ∈ℝn×n×n×nλ ^n× n× n× n satisfy λαβγδ≠0 _αβγδ≠ 0 for precisely α,β,γ,δ∈[n]α,β,γ,δ∈[n] that are not identical. Then (λαβγδQ(αβγδ):α,β,γ,δ∈[n])=0F( _αβγδQ^(αβγδ):α,β,γ,δ∈[n])=0 holds if and only if there exist u,v,w,x∈(ℝ∗)nu,v,w,x∈(R^*)^n such that λαβγδ=uαvβwγxδ _αβγδ=u_αv_βw_γx_δ for all α,β,γ,δ∈[n]α,β,γ,δ∈[n] that are not identical. Solution C.24. Model Response (Agent A f) Construction of the Polynomial Map F Let A(1),…,A(n)∈ℝ3×4A^(1),…,A^(n) ^3× 4 be Zariski-generic matrices. We identify the formal input space ℝ81n4R^81n^4 with the vector space of 4-way tensors ∈ℝ3n×3n×3n×3nX ^3n× 3n× 3n× 3n. We index the components of this tensor via composite multi-indices I=(α,i)I=(α,i), J=(β,j)J=(β,j), K=(γ,k)K=(γ,k), and L=(δ,ℓ)L=(δ, ), where α,β,γ,δ∈[n]α,β,γ,δ∈[n] specify the choice of matrices and i,j,k,ℓ∈1,2,3i,j,k, ∈\1,2,3\ specify their localized row indices. Evaluated over the parameters of the problem, the tensor coordinates map to: IJKL=λαβγδQijkℓ(αβγδ)=λαβγδdet[A(α)(i,:)A(β)(j,:)A(γ)(k,:)A(δ)(ℓ,:)].X_IJKL= _αβγδQ^(αβγδ)_ijk = _αβγδ bmatrixA^(α)(i,:)\\ A^(β)(j,:)\\ A^(γ)(k,:)\\ A^(δ)( ,:) bmatrix. Remark C.25. We say a parameter tuple (α,β,γ,δ)(α,β,γ,δ) is monochromatic if α=β=γ=δα=β=γ=δ, and non-monochromatic otherwise. For any α∈[n]α∈[n], the array Q(αααα)Q^(α) evaluates the determinant of a 4×44× 4 matrix whose four rows are drawn entirely from the same 3×43× 4 matrix A(α)A^(α). By the Pigeonhole Principle, at least two of these row choices must evaluate to the identical row of A(α)A^(α), making the determinant unconditionally vanish. Thus, Q(αααα)=0Q^(α)=0 universally. Consequently, IJKL=0X_IJKL=0 unconditionally for all monochromatic tuples. The problem dictates that λαβγδ≠0 _αβγδ≠ 0 solely across non-monochromatic configurations; nevertheless, extending the scalar parameters λαααα _α arbitrarily over the monochromatic bounds leaves the evaluated tensor X completely unaltered. We define four principal multilinear matrix flattenings of X, each mapping naturally to a structured matrix of dimensions 3n×27n33n× 27n^3: • M(1)M^(1): Rows indexed by I, columns by C1=(J,K,L)C_1=(J,K,L). • M(2)M^(2): Rows indexed by J, columns by C2=(I,K,L)C_2=(I,K,L). • M(3)M^(3): Rows indexed by K, columns by C3=(I,J,L)C_3=(I,J,L). • M(4)M^(4): Rows indexed by L, columns by C4=(I,J,K)C_4=(I,J,K). Definition C.26. We define the polynomial map :ℝ81n4→ℝNF:R^81n^4 ^N, where N=4(3n5)(27n35)N=4 3n5 27n^35, such that its coordinate functions evaluate all 5×55× 5 minors across the four flattenings M(1),M(2),M(3)M^(1),M^(2),M^(3), and M(4)M^(4). This multilinear representation immediately secures the problem’s first two requisite properties: • Property 1: The coordinate functions of F are standard determinantal minor expansions evaluated strictly over the formal tensor variables IJKLX_IJKL. Their coefficients consist exclusively of the constants ±1± 1 and 0. Thus, the polynomial map F operates completely independently of the underlying generic matrices A(1),…,A(n)A^(1),…,A^(n). • Property 2: Each coordinate function extracts a 5×55× 5 minor, rigorously defining it as a homogeneous polynomial of exact degree 55 over the tensor inputs. This uniform degree is invariant and strictly independent of n. Proof of Property 3: Sufficiency Assume there exist scalar vectors u,v,w,x∈(ℝ∗)nu,v,w,x∈(R^*)^n such that λαβγδ=uαvβwγxδ _αβγδ=u_αv_βw_γx_δ holds across all valid non-monochromatic configurations. By Remark C.25, since Q(αααα)=0Q^(α)=0, applying the identically factored substitution λαααα=uαvαwαxα _α=u_αv_αw_αx_α over the excluded monochromatic bounds leaves X perfectly unaltered. Absorbing these parameters via the multilinearity of the determinant globally yields: IJKL=det[uαA(α)(i,:)vβA(β)(j,:)wγA(γ)(k,:)xδA(δ)(ℓ,:)].X_IJKL= bmatrixu_αA^(α)(i,:)\\ v_βA^(β)(j,:)\\ w_γA^(γ)(k,:)\\ x_δA^(δ)( ,:) bmatrix. For the first flattening M(1)M^(1), let the localized row vector UI=uαA(α)(i,:)∈ℝ4U_I=u_αA^(α)(i,:) ^4. Expanding the determinant via Laplace expansion along this leading row extracts: MI,C1(1)=∑m=14(UI)m⋅cofactor1,m[UIvβA(β)(j,:)wγA(γ)(k,:)xδA(δ)(ℓ,:)].M^(1)_I,C_1= _m=1^4(U_I)_m·cofactor_1,m bmatrixU_I\\ v_βA^(β)(j,:)\\ w_γA^(γ)(k,:)\\ x_δA^(δ)( ,:) bmatrix. The four scalar cofactor terms intrinsically evaluate using exclusively the column configuration C1C_1 and remain completely decoupled from the localized row index I. Hence, M(1)M^(1) structurally factors into the matrix product of a 3n×43n× 4 matrix and a 4×27n34× 27n^3 matrix. This mathematically guarantees rank(M(1))≤4rank(M^(1))≤ 4, geometrically forcing all of its 5×55× 5 minors to evaluate to zero. Symmetric parity across the exterior maps subsequently ensures rank(M(m))≤4rank(M^(m))≤ 4 for all flattenings m∈1,2,3,4m∈\1,2,3,4\, unconditionally verifying ()=F(X)=0. Proof of Property 3: Necessity Assume ()=F(X)=0. The universal vanishing of all 5×55× 5 minors strictly bounds the rank identically as rank(M(m))≤4rank(M^(m))≤ 4 across all four principal flattenings. Subspace Intersections and the Evaluation Map Let S⊂ℝ27n3S ^27n^3 be the row space of M(1)M^(1), which inherently satisfies dimS≤4 S≤ 4. Let Uα=rowspan(A(α))⊂ℝ4U_α=rowspan(A^(α)) ^4 denote the generic 3-dimensional row space of matrix A(α)A^(α). We define a linear evaluation map Tα:Uα→ST_α:U_α→ S that maps a generic spatial vector y=∑i=13ciA(α)(i,:)∈Uαy= _i=1^3c_iA^(α)(i,:)∈ U_α into the equivalent linear combination of the corresponding rows within S. Evaluated locally on a subset of columns forming a fixed block B=(β,γ,δ)∈[n]3B=(β,γ,δ)∈[n]^3, this equivalently leverages multilinearity to output: Tα(y)B=λαBΨB(y),whereΨB(y)jkℓ=det[yA(β)(j,:)A(γ)(k,:)A(δ)(ℓ,:)],T_α(y)_B= _α B _B(y), _B(y)_jk = bmatrixy\\ A^(β)(j,:)\\ A^(γ)(k,:)\\ A^(δ)( ,:) bmatrix, and λαB _α B abbreviates λαβγδ _αβγδ. Evaluating ΨB(y)=0 _B(y)=0 is algebraically equivalent to stating that y∧w1∧w2∧w3=0y w_1 w_2 w_3=0 within the exterior algebra Λ4ℝ4 ^4R^4 for all valid combinations w1∈Uβ,w2∈Uγ,w3∈Uδw_1∈ U_β,w_2∈ U_γ,w_3∈ U_δ. Lemma C.27. Let V=ℝ4V=R^4, and let A(1),…,A(n)A^(1),…,A^(n) be generic 3×43× 4 matrices with row spaces Ui=rowspan(A(i))U_i=rowspan(A^(i)). (i) If B=(β,γ,δ)B=(β,γ,δ) is non-monochromatic, then kerΨB=0 _B=\0\. (i) If B=(β,β,β)B=(β,β,β) is monochromatic, then kerΨB=Uβ _B=U_β. Proof C.28. The constraint ΨB(y)=0 _B(y)=0 requires y∧w1∧w2∧w3=0y w_1 w_2 w_3=0 for all w1∈Uβ,w2∈Uγ,w3∈Uδw_1∈ U_β,w_2∈ U_γ,w_3∈ U_δ. (i) Assume B is non-monochromatic. Since the wedge product is commutative up to sign, we may assume without loss of generality that β≠δβ≠δ. We consider the structural span of the 2-forms w1∧w2w_1 w_2. If β≠γβ≠γ, UβU_β and UγU_γ are distinct generic 3-dimensional subspaces intersecting in a 2-dimensional subspace within V. Constructing a basis adapted to this intersection yields 6 linearly independent 2-forms, proving the span of w1∧w2w_1 w_2 covers the entirety of Λ2V ^2V. If β=γβ=γ, the span of w1∧w2w_1 w_2 for w1,w2∈Uβw_1,w_2∈ U_β evaluates exactly to Λ2Uβ ^2U_β, a 3-dimensional subspace natively housed within Λ2V ^2V. In both cases, the span contains Λ2Uβ ^2U_β. Consequently, the overarching span of w1∧w2∧w3w_1 w_2 w_3 contains Λ2Uβ∧Uδ ^2U_β U_δ. Since β≠δβ≠δ, the generic 3-dimensional subspaces UβU_β and UδU_δ reliably intersect in a 2-dimensional subspace. By decomposing this space as Uδ=(Uβ∩Uδ)⊕span(v)U_δ=(U_β∩ U_δ) (v) for a specific v∈Uδ∖Uβv∈ U_δ U_β, we deduce: Λ2Uβ∧Uδ=(Λ2Uβ∧(Uβ∩Uδ))⊕(Λ2Uβ∧v)=Λ3Uβ⊕(Λ2Uβ∧v). ^2U_β U_δ=( ^2U_β (U_β∩ U_δ)) ( ^2U_β v)= ^3U_β ( ^2U_β v). It is immediate that Λ3Uβ ^3U_β is exactly 1-dimensional. Furthermore, since v∉Uβv∉ U_β, wedging with v injectively maps Λ2Uβ ^2U_β into Λ3V ^3V, meaning Λ2Uβ∧v ^2U_β v is strictly 3-dimensional. To verify the trivial intersection parity, suppose an element 0≠η∈Λ3Uβ0≠η∈ ^3U_β satisfies η=ω∧vη=ω v for some ω∈Λ2Uβω∈ ^2U_β. Given any x∈Uβx∈ U_β, evaluating η∧x=0η x=0 strictly forces ω∧x∧v=0ω x v=0. Since V=Uβ⊕span(v)V=U_β (v), we must assert ω∧x=0ω x=0 in Λ3Uβ ^3U_β uniformly over all x∈Uβx∈ U_β. The non-degenerate pairing dictates this is only possible if ω=0ω=0, yielding η=0η=0, forming a contradiction. Therefore, the algebraic sum directly establishes itself over 1+3=41+3=4 dimensions. Because dimΛ3V=4 ^3V=4, the established span encompasses exactly Λ3V ^3V. Enforcing y∧Ω=0y =0 for all valid Ω∈Λ3V ∈ ^3V unconditionally forces y=0y=0. (i) If B=(β,β,β)B=(β,β,β), the span corresponding to w1∧w2∧w3w_1 w_2 w_3 converges exclusively to Λ3Uβ ^3U_β, representing the 1-dimensional volume form bounding UβU_β. Resolving y∧Λ3Uβ=0y ^3U_β=0 structurally enforces y∈Uβy∈ U_β. Given n≥5n≥ 5, for any isolated generic index α∈[n]α∈[n], we explicitly choose a non-monochromatic block B=(σ,σ,τ)B=(σ,σ,τ) mapping elements strictly disjoint from α (requiring exactly 3≤n3≤ n distinct indices). Because the evaluated tuple (α,σ,σ,τ)(α,σ,σ,τ) is strictly non-monochromatic, the premise guarantees λαB≠0 _α B≠ 0. Bounded against Lemma C.27(i), evaluating Tα(y)B=0⟹y=0T_α(y)_B=0 y=0, validating that TαT_α is universally injective. Its equivalently mapped image Wα=Tα(Uα)⊂SW_α=T_α(U_α)⊂ S firmly maintains dimension 3. Anchored dynamically against dimS≤4 S≤ 4, Grassmann’s formula for the dimension of subspace intersections necessitates: dim(Wα∩Wμ)=dimWα+dimWμ−dim(Wα+Wμ)≥3+3−4=2for any α≠μ. (W_α∩ W_μ)= W_α+ W_μ- (W_α+W_μ)≥ 3+3-4=2 any α≠μ. Universal Local Factoring Let Eα,μ=Tα−1(Wα∩Wμ)⊂UαE_α,μ=T_α^-1(W_α∩ W_μ)⊂ U_α. Grounded strictly by injectivity, dimEα,μ≥2 E_α,μ≥ 2. For any vector x∈Eα,μx∈ E_α,μ, there universally exists a unique vector y∈Uμy∈ U_μ firmly satisfying Tα(x)=Tμ(y)T_α(x)=T_μ(y). Pivoting on n≥5n≥ 5, we securely configure a non-monochromatic block B0=(σ,σ,τ)B_0=(σ,σ,τ) mutually disjoint from both bounds α and μ (leveraging exactly 2+2=4≤n2+2=4≤ n indices). Extracting locally outputs Tα(x)B0=Tμ(y)B0T_α(x)_B_0=T_μ(y)_B_0, mapping identically onto λαB0ΨB0(x)=λμB0ΨB0(y) _α B_0 _B_0(x)= _μ B_0 _B_0(y). Applying the multilinearity of ΨB0 _B_0 enforces ΨB0(λαB0x−λμB0y)=0 _B_0( _α B_0x- _μ B_0y)=0. Validating against kerΨB0=0 _B_0=\0\ and knowing the corresponding scalars unconditionally correspond to non-monochromatic configurations (thus are non-zero), we extract λαB0x=λμB0y _α B_0x= _μ B_0y. Structuring cα,μ=λαB0/λμB0≠0c_α,μ= _α B_0/ _μ B_0≠ 0, we unconditionally isolate y=cα,μxy=c_α,μx. Since y∈Uμy∈ U_μ and cα,μ≠0c_α,μ≠ 0, it implies x∈Uμx∈ U_μ. Thus, Eα,μ⊆Uα∩UμE_α,μ U_α∩ U_μ. Bounding the intersection of two generic 3-dimensional spaces in ℝ4R^4 caps the dimension at exactly 2, ensuring Eα,μ=Uα∩UμE_α,μ=U_α∩ U_μ. Using the explicit relation Tα(x)=Tμ(cα,μx)T_α(x)=T_μ(c_α,μx), we logically evaluate the mappings globally over a generalized tracking block B: Tα(x)B=Tμ(cα,μx)B⟹(λαB−cα,μλμB)ΨB(x)=0for all x∈Uα∩Uμ.T_α(x)_B=T_μ(c_α,μx)_B ( _α B-c_α,μ _μ B) _B(x)=0 all x∈ U_α∩ U_μ. Because dim(Uα∩Uμ)=2 (U_α∩ U_μ)=2, we mathematically isolate the coefficients λαB=cα,μλμB _α B=c_α,μ _μ B by filtering against kerΨB _B: • If B is non-monochromatic, kerΨB=0 _B=\0\. Consequently, for any valid non-zero x∈Uα∩Uμx∈ U_α∩ U_μ, resolving ΨB(x)≠0 _B(x)≠ 0 securely enforces λαB=cα,μλμB _α B=c_α,μ _μ B. • If B=(β,β,β)B=(β,β,β) with β∉α,μβ∉\α,μ\, Lemma C.27 forces kerΨB=Uβ _B=U_β. The generic intersection (Uα∩Uμ)∩Uβ(U_α∩ U_μ)∩ U_β yields exactly dimension 2+3−4=12+3-4=1. Since dim(Uα∩Uμ)=2 (U_α∩ U_μ)=2, there exists an element x∈(Uα∩Uμ)∖Uβx∈(U_α∩ U_μ) U_β, universally validating ΨB(x)≠0 _B(x)≠ 0. This rigorously forces λαB=cα,μλμB _α B=c_α,μ _μ B. Therefore, the mapped equivalence holds cleanly for all valid evaluations B∉(α,α,α),(μ,μ,μ)B∉\(α,α,α),(μ,μ,μ)\. To decipher the transitive cocycle condition cα,ν=cα,μcμ,νc_α,ν=c_α,μc_μ,ν for three distinct variable indices α,μ,ν∈[n]α,μ,ν∈[n], we purposefully select a 2-element non-monochromatic block B2=(ρ,ρ,κ)B_2=(ρ,ρ,κ) mutually disjoint from α,μα,μ, and ν. This geometric verification guarantees applicability because 3+2=5≤n3+2=5≤ n. Resolving outside monochromatic boundaries yields λαB2=cα,μλμB2 _α B_2=c_α,μ _μ B_2, λμB2=cμ,νλνB2 _μ B_2=c_μ,ν _ν B_2, and λαB2=cα,νλνB2 _α B_2=c_α,ν _ν B_2. Directly dividing these inherently non-zero quantities verifies the cocycle property cα,ν=cα,μcμ,νc_α,ν=c_α,μc_μ,ν. We define u1=1u_1=1 and uα=cα,1u_α=c_α,1 for α≥2α≥ 2, meaning cα,μ=uα/uμc_α,μ=u_α/u_μ. We securely decouple YB=λ1BY_B= _1B evaluating B≠(1,1,1)B≠(1,1,1), alongside bounds Y111=λ2,1,1,1/u2Y_111= _2,1,1,1/u_2. This strictly limits coordinates globally as λαB=uαYB _α B=u_αY_B over all non-monochromatic tuples (α,B)(α,B): • Bounding B∉(1,1,1),(α,α,α)B∉\(1,1,1),(α,α,α)\, we obtain λαB=cα,1λ1B=uαYB _α B=c_α,1 _1B=u_αY_B. • Bounding over B=(1,1,1)B=(1,1,1), the evaluated tuple (α,1,1,1)(α,1,1,1) strictly mandates non-monochromatic parity, inherently forcing α≠1α≠ 1. Fixing μ=2μ=2 (valid using n≥5n≥ 5), resolving α≠2α≠ 2 outputs λα,1,1,1=cα,2λ2,1,1,1=(uα/u2)λ2,1,1,1=uαY111 _α,1,1,1=c_α,2 _2,1,1,1=(u_α/u_2) _2,1,1,1=u_αY_111. For α=2α=2, identity holds trivially. Mirroring sequential deductions identically over equivalent matrix flattenings M(2)M^(2), M(3)M^(3), and M(4)M^(4) guarantees the existence of complementary vectors v,w,x∈(ℝ∗)nv,w,x∈(R^*)^n mapped over spatial tracking tensors Z,P,QZ,P,Q, uniformly restricting parameters universally across valid subsets: λαβγδ=uαYβγδ=vβZαγδ=wγPαβδ=xδQαβγ. _αβγδ=u_αY_βγδ=v_βZ_αγδ=w_γP_αβδ=x_δQ_αβγ. Global Connectedness of the Valid Configuration Graph Let ⊂[n]4T⊂[n]^4 denote the discrete subset of exclusively non-monochromatic valid parameter multi-tuples. We formulate the universally normalized relational map H:→ℝH:T explicitly by: H(T)=λαβγδuαvβwγxδ,H(T)= _αβγδu_αv_βw_γx_δ, evaluated strictly over T=(α,β,γ,δ)∈T=(α,β,γ,δ) . Leveraging our preceding factorizations cleanly parses H(T)=YβγδvβwγxδH(T)= Y_βγδv_βw_γx_δ, which is manifestly independent of the leading coordinate α. Consequently, H(T)H(T) functionally persists invariantly under dynamic shifting of the first localized coordinate element natively assuming the newly formed tuple remains bounded strictly within T. Extrapolating symmetric multilinear independence logically dictates that H(T)H(T) is invariant across alterations to any single isolated coordinate, provided the intermediate tuples strictly evaluate inside T. We conceptualize T topologically as a configuration graph network connecting multi-tuples differing exactly by a single localized coordinate. The map H(T)H(T) evaluates trivially to a constant value across any connected component of this graph. We now strictly establish that T is entirely globally connected. Let T∈T . Because T is non-monochromatic, it contains at most 3 identical coordinate values. 1. If T contains exactly 3 identical coordinates (e.g., matching (a,a,a,b)(a,a,a,b) with a≠ba≠ b), we can shift one of the identical coordinates to a uniquely evaluated constant c∉a,bc∉\a,b\. Since n≥5≥3n≥ 5≥ 3, such a generic c is universally valid. The resulting adjacent tuple (e.g., (c,a,a,b)(c,a,a,b)) inherently remains within T and correctly houses at most 2 identical coordinates. Thus, every bounded tuple with 3 identical constraints trivially bounds adjacent to a tuple harboring at most 2 identical coordinates. 2. Over localized constraints containing at most 2 identical elements, we sequentially alter coordinates one-by-one, scanning left-to-right, to strictly match a non-intersecting distinctly evaluated target sequence, specifically (1,2,3,4)(1,2,3,4). Because n≥5n≥ 5, such a discrete target sequence is naturally guaranteed to exist. At any traversal step k∈1,2,3,4k∈\1,2,3,4\, the intermediate tuple identically comprises a successfully mapped prefix of length k containing strictly unique target elements, and an unchanged trailing suffix of length 4−k4-k natively drawn from the original values of T. Because the prefix sequence is constrained to strictly distinct entries, any given element can appear at most once across the prefix. Since the foundational original tuple T maintained at most 2 identical evaluations, any mapped element can occur at most twice within the unchanged tracking suffix. Consequently, the maximum element occurrence frequency across the entire intermediate tuple rigorously bounds to 1 (from the distinct prefix)+2 (from the unchanged suffix)=31 (from the distinct prefix)+2 (from the unchanged suffix)=3. This combinatorially ensures that no intermediate topological step can theoretically collapse to a frequency of 4 (identically monochromatic parity), guaranteeing that every sequence transition evaluates safely and dynamically within the strict confines of the valid graph T. Since every multi-tuple topologically connects directly to the valid boundary path (1,2,3,4)(1,2,3,4), the entire configuration graph T is globally connected. Therefore, the function H(T)H(T) equates universally to a non-zero symmetric mapping scalar K exclusively over all strictly valid configurations T∈T . Scaling out the identity via uα←Kuαu_α← Ku_α rigorously establishes that λαβγδ=uαvβwγxδ _αβγδ=u_αv_βw_γx_δ identically bridges all generic, non-monochromatic parameterizations. This fully satisfies Property 3 and conclusively completes the proof. C.6 Problem 10 Problem C.29. Fullproof # 10 Given a d-way tensor ∈ℝn1×n2×⋯×ndT ^n_1× n_2×·s× n_d such that the data is unaligned (meaning the tensor T has missing entries), we consider the problem of computing a CP decomposition of rank r where some modes are infinite-dimensional and constrained to be in a Reproducing Kernel Hilbert Space (RKHS). We want to solve this using an alternating optimization approach, and our question is focused on the mode-k subproblem for an infinite-dimensional mode. For the subproblem, then CP factor matrices A1,…,Ak−1,Ak+1,…,AdA_1,…,A_k-1,A_k+1,…,A_d are fixed, and we are solving for AkA_k. Our notation is as follows. Let N=∏iniN= _in_i denote the product of all sizes. Let n≡nkn≡ n_k be the size of mode k, let M=∏i≠kniM= _i≠ kn_i be the product of all dimensions except k, and assume n≪Mn M. Since the data are unaligned, this means only a subset of T’s entries are observed, and we let q≪Nq N denote the number of observed entries. We let T∈ℝn×MT ^n× M denote the mode-k unfolding of the tensor T with all missing entries set to zero. The vecvec operations creates a vector from a matrix by stacking its columns, and we let S∈ℝN×qS ^N× q denote the selection matrix (a subset of the N×N× N identity matrix) such that STvec(T)S^Tvec(T) selects the q known entries of the tensor T from the vectorization of its mode-k unfolding. We let Z=Ad⊙⋯⊙Ak+1⊙Ak−1⊙⋯⊙A1∈ℝM×rZ=A_d ·s A_k+1 A_k-1 ·s A_1 ^M× r be the Khatri-Rao product of the factor matrices corresponding to all modes except mode k. We let B=TZB=TZ denote the MTTKRP of the tensor T and Khatri-Rao product Z. We assume Ak=KWA_k=KW where K∈ℝn×nK ^n× n denotes the psd RKHS kernel matrix for mode k. The matrix W of size n×rn× r is the unknown for which we must solve. The system to be solved is [(Z⊗K)TSST(Z⊗K)+λ(Ir⊗K)]vec(W)=(Ir⊗K)vec(B). [(Z K)^TS^T(Z K)+λ(I_r K) ]vec(W)=(I_r K)vec(B). Here, IrI_r denotes the r×r× r identity matrix. This is a system of size nr×nrnr× nr Using a standard linear solver costs O(n3r3)O(n^3r^3), and explicitly forming the matrix is an additional expense. Explain how an iterative preconditioned conjugate gradient linear solver can be used to solve this problem more efficiently. Explain the method and choice of preconditioner. Explain in detail how the matrix-vector products are computed and why this works. Provide complexity analysis. We assume n,r<q≪Nn,r<q N. Avoid any computation of order N. Solution C.30. Model Response (Agent B) Problem Formulation Given a d-way tensor ∈ℝn1×n2×⋯×ndT ^n_1× n_2×·s× n_d such that the data is incomplete (meaning the tensor T has missing entries), we consider the problem of computing a Canonical Polyadic (CP) decomposition of rank r. We assume that the true underlying generative functions for some modes are continuous and reside in an infinite-dimensional Reproducing Kernel Hilbert Space (RKHS), whereas the observed tensor T represents a finite-dimensional discretization (or evaluation) of these functions at discrete points. We solve this decomposition problem using an alternating optimization approach. Our analysis focuses on the mode-k subproblem for such an RKHS-constrained mode. For the subproblem, the CP factor matrices A1,…,Ak−1,Ak+1,…,AdA_1,…,A_k-1,A_k+1,…,A_d are fixed, and we are solving for the factor matrix AkA_k. Notation and Model Setup Let N=∏i=1dniN= _i=1^dn_i denote the product of all tensor dimensions. Let n≡nkn≡ n_k be the size of mode k, and let M=∏i≠kniM= _i≠ kn_i be the product of all dimensions except k, where we assume n≪Mn M. Since the data is incomplete, only a subset of T’s entries are observed. We let q≪Nq N denote the number of observed entries. Let T∈ℝn×MT ^n× M denote the mode-k unfolding of the tensor T with all missing entries initialized to zero. The vec(⋅)vec(·) operation creates a vector from a matrix by stacking its columns. We let S∈ℝN×qS ^N× q denote the selection matrix (composed of a subset of the columns of the N×N× N identity matrix) such that STvec(T)S^Tvec(T) selects the q known entries of the tensor T from the vectorization of its mode-k unfolding. Let Z=Ad⊙⋯⊙Ak+1⊙Ak−1⊙⋯⊙A1∈ℝM×rZ=A_d ·s A_k+1 A_k-1 ·s A_1 ^M× r be the Khatri-Rao product of the factor matrices corresponding to all modes except mode k. To strictly avoid (N)O(N) memory and computational limits, Z is never explicitly constructed in full. We let B=TZ∈ℝn×rB=TZ ^n× r denote the Matricized Tensor Times Khatri-Rao Product (MTTKRP) of the tensor T and the conceptually defined Khatri-Rao product Z. We parameterize the factor matrix as Ak=KWA_k=KW, where K∈ℝn×nK ^n× n denotes the symmetric, positive semi-definite RKHS kernel matrix for mode k evaluated at the discretization points. The matrix W∈ℝn×rW ^n× r is the unknown variable for which we must solve. Derivation of the Linear System To find W, we minimize a regularized least-squares objective function over the observed entries. Setting the gradient of this objective with respect to vec(W)vec(W) to zero yields a linear system. The right-hand side (RHS) of this system stems from the gradient of the data fidelity term, which initially takes the form (Z⊗K)TSSTvec(T)(Z K)^TS^Tvec(T). We rigorously simplify this expression. Since the missing entries in T are initialized to zero, applying the projection matrix SSTSS^T acts identically on the non-zero entries, yielding SSTvec(T)=vec(T)S^Tvec(T)=vec(T). Consequently, the RHS evaluates as: (Z⊗K)TSSTvec(T) (Z K)^TS^Tvec(T) =(Z⊗K)Tvec(T) =(Z K)^Tvec(T) =(ZT⊗KT)vec(T). =(Z^T K^T)vec(T). Because the kernel matrix K is symmetric (KT=K^T=K), standard properties of the Kronecker product allow us to rewrite this cleanly as: (ZT⊗K)vec(T)=vec(KTZ).(Z^T K)vec(T)=vec(KTZ). Substituting the MTTKRP definition B=TZB=TZ, we arrive at vec(KB)=(Ir⊗K)vec(B)vec(KB)=(I_r K)vec(B). Thus, the linear system to be solved is: [(Z⊗K)TSST(Z⊗K)+λ(Ir⊗K)]vec(W)=(Ir⊗K)vec(B), [(Z K)^TS^T(Z K)+λ(I_r K) ]vec(W)=(I_r K)vec(B), (1) where IrI_r denotes the r×r× r identity matrix and λ>0λ>0 is the regularization parameter. This is a symmetric positive semi-definite system of size nr×nrnr× nr. Using a standard direct linear solver requires (n3r3)O(n^3r^3) operations. Furthermore, explicitly forming the system matrix entails an additional and prohibitive computational expense. Given the operational assumption that n,r<q≪Nn,r<q N, it is imperative to solve this system without performing any computations of order N. Preconditioned Conjugate Gradient Solver To efficiently solve the large-scale system in (1), we employ the Preconditioned Conjugate Gradient (PCG) method. As an iterative algorithm, PCG requires only the action of the system matrix on a vector, bypassing the need to explicitly construct the nr×nrnr× nr coefficient matrix. Efficient Matrix-Vector Products The core computational step in PCG is evaluating the matrix-vector product y=ℋvec(V)y=Hvec(V) at each iteration, where ℋ=(Z⊗K)TSST(Z⊗K)+λ(Ir⊗K)H=(Z K)^TS^T(Z K)+λ(I_r K) is the system matrix, and V∈ℝn×rV ^n× r is a reshaped intermediate dense matrix representing the search direction. We evaluate the product y in an (N)O(N)-free manner through the following sequence of operations: 1. First Kernel Multiplication: Compute U=KVU=KV. Since K∈ℝn×nK ^n× n and V∈ℝn×rV ^n× r, this dense matrix multiplication requires (n2r)O(n^2r) operations. 2. Sparse Residual Evaluation: We observe that (Z⊗K)vec(V)=vec(KVZT)=vec(UZT)(Z K)vec(V)=vec(KVZ^T)=vec(UZ^T). The operation SSTvec(UZT)S^Tvec(UZ^T) extracts the entries of the dense n×Mn× M matrix UZTUZ^T strictly at the q observed indices specified by S, effectively mapping all unobserved entries to zero. Instead of computing the full dense n×Mn× M matrix UZTUZ^T, we evaluate the inner products of the corresponding rows of U and Z exclusively for the q observed entries. Crucially, to strictly avoid an (N)O(N) memory and time bottleneck, the full Khatri-Rao product matrix Z∈ℝM×rZ ^M× r is never explicitly formed. The required rows of Z (corresponding to the multi-indices of the q observed entries) are evaluated on-the-fly from the underlying CP factor matrices AiA_i (i≠ki≠ k). Assuming the tensor order d is a small constant, forming a single row of Z takes (r)O(r) operations. This dynamically generates a sparse n×Mn× M matrix Y containing exactly q non-zero elements. Generating the necessary rows of Z dynamically and evaluating these q specific entries requires strictly (qr)O(qr) operations. 3. Sparse Matrix Multiplication: Next, leveraging the symmetry of K (KT=K^T=K), we apply the transpose operator (Z⊗K)T=ZT⊗KT=ZT⊗K(Z K)^T=Z^T K^T=Z^T K to the sparse vector vec(Y)vec(Y). By the standard Kronecker product vectorization identity vec(ABC)=(CT⊗A)vec(B)vec(ABC)=(C^T A)vec(B), applying this operator to vec(Y)vec(Y) translates to the mathematical operation vec(KYZ)vec(KYZ). To compute this efficiently, we first evaluate the intermediate unvectorized product P=YZ∈ℝn×rP=YZ ^n× r. Because Y possesses only q non-zeros, its right-multiplication only requires the rows of Z corresponding to its non-zero columns. Rather than instantiating Z as a full matrix, we employ standard sparse MTTKRP techniques: we dynamically evaluate only these necessary rows of Z on-the-fly (or reuse them if cached from the previous step). This sparse matrix multiplication cleanly circumvents the (N)O(N) instantiation of Z and requires exactly (qr)O(qr) operations. 4. Second Kernel Multiplication: We left-multiply P by K to compute KP∈ℝn×rKP ^n× r. This dense matrix multiplication requires (n2r)O(n^2r) operations. 5. Regularization Addition: The Tikhonov regularization term simplifies to λ(Ir⊗K)vec(V)=vec(λKV)=vec(λU)λ(I_r K)vec(V)=vec(λ KV)=vec(λ U). The final evaluated vector y is cleanly obtained via the addition: y=vec(KP+λU).y=vec(KP+λ U). Jacobi Preconditioner The convergence rate of PCG strongly depends on the condition number of the system matrix. RKHS kernel matrices frequently exhibit rapidly decaying eigenvalues, and the non-uniform sampling induced by SSTSS^T further degrades system conditioning. To accelerate convergence, we utilize a Jacobi (diagonal) preconditioner ℳM, defined as the inverse of the diagonal elements of ℋH. The diagonal elements of ℋH can be extracted efficiently without forming the full matrix. Let K~=K∘K∈ℝn×n K=K K ^n× n, where ∘ denotes the Hadamard (element-wise) product. Conceptually, let Z~=Z∘Z∈ℝM×r Z=Z Z ^M× r denote the element-wise square of the Khatri-Rao product. Let Ω∈ℝn×M ^n× M be the sparse binary indicator matrix of the observed entries, such that Ωi,j=1 _i,j=1 if the entry (i,j)(i,j) is observed, and 0 otherwise. We now rigorously derive the diagonal of the data-fidelity term (Z⊗K)TSST(Z⊗K)(Z K)^TS^T(Z K). For a generic matrix Q=Z⊗KQ=Z K and a diagonal weight matrix =SSTW=S^T, the diagonal of the quadratic form QTQ^TWQ (expressed as a column vector) is given by the identity (Q∘Q)Tdiag()(Q Q)^Tdiag(W). Since the diagonal of the projection matrix SSTSS^T evaluates exactly to the vectorized observation mask vec(Ω)vec( ), we can expand this expression using the mixed-product property of the Kronecker and Hadamard products. Letting vec(Ddata)vec(D_data) denote the diagonal of the data-fidelity term reshaped as a vector, we have: vec(Ddata) (D_data) =((Z⊗K)∘(Z⊗K))Tvec(Ω) = ((Z K) (Z K) )^Tvec( ) =((Z∘Z)⊗(K∘K))Tvec(Ω) = ((Z Z) (K K) )^Tvec( ) =(Z~T⊗K~T)vec(Ω). =( Z^T K^T)vec( ). Because the kernel matrix K is symmetric, its Hadamard square K~ K is also symmetric (K~T=K~ K^T= K). Thus, the expression simplifies to (Z~T⊗K~)vec(Ω)( Z^T K)vec( ). Finally, utilizing the standard Kronecker product vectorization identity (BT⊗A)vec(X)=vec(AXB)(B^T A)vec(X)=vec(AXB), we substitute B=Z~B= Z, A=K~A= K, and X=ΩX= to directly evaluate the expression as vec(K~ΩZ~)vec( K Z). Reshaping this vector back into an n×rn× r matrix rigorously yields the stated analytical form: Ddata=K~(ΩZ~).D_data= K( Z). To preserve the (N)O(N)-free complexity bound, the matrix Z~ Z is never fully formed. Instead, the product ΩZ~ Z is evaluated by computing only the required rows of Z~ Z corresponding to the non-zero columns of Ω . These rows are obtained on-the-fly by squaring the elements of the dynamically computed rows of Z. Computing the sparse-dense matrix product ΩZ~ Z in this dynamic fashion costs (qr)O(qr), and the subsequent dense multiplication by K~ K costs (n2r)O(n^2r). The diagonal of the regularization term λ(Ir⊗K)λ(I_r K), when reshaped into an n×rn× r matrix, is simply Dreg=λdiag(K)rTD_reg= (K)1_r^T, where diag(K)diag(K) is the column vector containing the diagonal entries of K, and r∈ℝr1_r ^r is the vector of all ones. Thus, the Jacobi preconditioner is formed by taking the element-wise inverse of D=Ddata+DregD=D_data+D_reg. Constructing this preconditioner upfront requires a one-time cost of (qr+n2r)O(qr+n^2r). Complexity Analysis By meticulously structuring the computations as outlined above and leveraging the on-the-fly row evaluation of Khatri-Rao products, the evaluation of the matrix-vector products and the preconditioner rigorously circumvents the prohibitive (N)O(N) operations that would result from forming the full Khatri-Rao product or explicitly processing the full unfolded tensor. The overall computational complexity per PCG iteration is strictly bounded by the sum of the individual algorithmic steps: (n2r)+(qr)+(qr)+(n2r)+(nr)=(qr+n2r).O(n^2r)+O(qr)+O(qr)+O(n^2r)+O(nr)=O(qr+n^2r). Given the operational regime where n,r<q≪Nn,r<q N, this strategy guarantees a massive reduction in computational overhead, establishing a highly scalable and optimal method for updating infinite-dimensional RKHS modes within large-scale, incomplete CP tensor decompositions. C.7 Independent Public Deep Think Evaluation for Problem 10 For Problem 10, Aryan Mokhtari and David Woodruff conducted an independent, human-guided evaluation using the publicly available Gemini 3 Deep Think model. The resulting solution was also sent to the FirstProof authors in the same February 13 e-mail prior to the deadline. We felt the solution was interesting because this model is publicly available and performs significantly less inference scaling than Aletheia. The authors generated several samples and asked the model to concatenate and compare the two strongest outputs found, yielding an optimized solution for Problem 10. While Aletheia’s autonomous Agent B solution maintains an (qr)O(qr) term per Preconditioned Conjugate Gradient (PCG) iteration, the concatenated public model output utilizes a pre-aggregated geometry approach (via per-row Gram accumulators) with an exact block-Jacobi preconditioner. This achieves a per-iteration cost of (n2r+nr2)O(n^2r+nr^2), strictly removing the dependency on q during the iterative loop. For dense observation regimes where q=ω(n)q=ω(n), this provides a stronger theoretical complexity bound than Aletheia B, as well as the official human author solution ((qnr)O(qnr)). We note that Aletheia A also autonomously discovered this exact optimal O(n2r+nr2)O(n^2r+nr^2) bound and block-Jacobi preconditioner (its solution is available online here). Below we provide the output, as generated, compared, and concatenated by the public Gemini 3 Deep Think model. We format the prompt and response to match the style of the other appendices. FirstProof # 10 Given a d-way tensor ∈ℝn1×n2×⋯×ndT ^n_1× n_2×…× n_d such that the data is unaligned (meaning the tensor T has missing entries), we consider the problem of computing a CP decomposition of rank r where some modes are infinite-dimensional and constrained to be in a Reproducing Kernel Hilbert Space (RKHS). We want to solve this using an alternating optimization approach, and our question is focused on the mode-k subproblem for an infinite-dimensional mode. For the subproblem, then CP factor matrices A1,…,Ak−1,Ak+1,…,AdA_1,…,A_k-1,A_k+1,…,A_d are fixed, and we are solving for AkA_k. Our notation is as follows. Let N=∏iniN= _in_i denote the product of all sizes. Let n≡nkn≡ n_k be the size of mode k, let M=∏i≠kniM= _i≠ kn_i be the product of all dimensions except k, and assume n≪Mn M. Since the data are unaligned, this means only a subset of T’s entries are observed, and we let q≪Nq N denote the number of observed entries. We let T∈ℝn×MT ^n× M denote the mode-k unfolding of the tensor T with all missing entries set to zero. The vec operations creates a vector from a matrix by stacking its columns, and we let S∈ℝN×qS ^N× q denote the selection matrix (a subset of the N×N× N identity matrix) such that STvec(T)S^Tvec(T) selects the q known entries of the tensor T from the vectorization of its mode-k unfolding. We let Z=Ad⊙⋯⊙Ak+1⊙Ak−1⊙⋯⊙A1∈ℝM×rZ=A_d ·s A_k+1 A_k-1 ·s A_1 ^M× r be the Khatri-Rao product of the factor matrices corresponding to all modes except mode k. We let B=TZB=TZ denote the MTTKRP of the tensor T and Khatri-Rao product Z. We assume Ak=KWA_k=KW where K∈ℝn×nK ^n× n denotes the psd RKHS kernel matrix for mode k. The matrix W of size n×rn× r is the unknown for which we must solve. The system to be solved is [(Z⊗K)TSST(Z⊗K)+λ(Ir⊗K)]vec(W)=(Ir⊗K)vec(B).[(Z K)^TS^T(Z K)+λ(I_r K)]vec(W)=(I_r K)vec(B). Here, IrI_r denotes the r×r× r identity matrix. This is a system of size nr×nrnr× nr. Using a standard linear solver costs (n3r3)O(n^3r^3), and explicitly forming the matrix is an additional expense. Explain how an iterative preconditioned conjugate gradient linear solver can be used to solve this problem more efficiently. Explain the method and choice of preconditioner. Explain in detail how the matrix-vector products are computed and why this works. Provide complexity analysis. We assume n,r<q≪Nn,r<q N. Avoid any computation of order N. Model Response (Public Deep Think) Efficient Preconditioned Conjugate Gradient Solvers for Unaligned RKHS-Constrained CP Subproblems A Comparative Algorithmic Analysis Abstract. This document presents and compares two highly optimized, matrix-free Preconditioned Conjugate Gradient (PCG) solvers for the exact same problem: solving the mode-k subproblem in an unaligned, RKHS-constrained CP tensor decomposition. Both methods successfully bypass the prohibitive ambient dimensions (N)O(N) and (M)O(M) by exploiting Kronecker algebra. However, they diverge sharply in how they handle unaligned data geometry, their preconditioner design, and their variable tracking inside the Krylov loop. A comprehensive comparative analysis highlights the specific advantages of each solver. 1. Introduction and Problem Formulation We consider the alternating optimization subproblem for an infinite-dimensional mode k constrained to a Reproducing Kernel Hilbert Space (RKHS). The factor matrix is Ak=KWA_k=KW, where K∈ℝn×nK ^n× n is the symmetric positive semi-definite (psd) RKHS kernel matrix and W∈ℝn×rW ^n× r is the unknown weight matrix. The symmetric linear system to solve is: [(Z⊗K)TSST(Z⊗K)+λ(Ir⊗K)]⏟ℋvec(W)=(Ir⊗K)vec(B)⏟c, [(Z K)^TS^T(Z K)+λ(I_r K) ]_Hvec(W)= (I_r K)vec(B)_c, (2) where ℋ∈ℝnr×nrH ^nr× nr. Let Ω=1,…,q =\1,…,q\ index the observed entries. For each observation m∈Ωm∈ , we are given its target tensor value ym∈ℝy_m , its coordinate in mode k as im∈1,…,ni_m∈\1,…,n\, and its flattened spatial coordinate in the other modes as jm∈1,…,Mj_m∈\1,…,M\. Directly assembling ℋH requires (qn2r2)O(qn^2r^2) memory, and direct dense solvers demand (n3r3)O(n^3r^3) time. Furthermore, explicitly evaluating vectors of size N or the Khatri-Rao product Z∈ℝM×rZ ^M× r introduces prohibitive (N)O(N) and (M)O(M) complexities. Instead, we deploy iterative Preconditioned Conjugate Gradient (PCG) linear solvers acting directly on the matrix representation W∈ℝn×rW ^n× r. 2. Comparative Analysis of the Two Approaches Both Approach 1 and Approach 2 (detailed in Sections 3 and 4) present highly optimized, matrix-free PCG solvers. However, they represent two fundamentally different algorithmic philosophies. Here is a detailed comparative analysis: 2.1. Data Geometry & Matrix-Vector Product (MVP) The most significant computational difference lies in how they execute the exact Matrix-Vector Product against the q observed tensor entries. • Approach 1 (Pre-Aggregated Geometry): – Approach: Aggregates the unaligned data upfront. It computes n independent r×r× r symmetric matrices E(i)E^(i) during the setup phase. – Iteration Cost: (n2r+nr2)O(n^2r+nr^2). – Implication: By pre-computing these small matrices, the number of observations q is completely removed from the PCG iteration loop. The MVP becomes strictly independent of the dataset size. • Approach 2 (On-the-fly Sparse Accumulation): – Approach: Bypasses pre-aggregation. It keeps the q spatial observation vectors (ZΩZ_ ) in memory and loops over all q points to compute dot products and accumulate gradients at every single iteration. – Iteration Cost: (n2r+qr)O(n^2r+qr). – Implication: This limits per-iteration scalability. In typical tensor problems, the number of observations is massive (q≫n≫rq n r). Forcing the iteration loop to process q items every step creates a massive computational bottleneck. 2.2. Preconditioner Design The linear system is severely ill-conditioned. The two approaches target completely different sources of this ill-conditioning. • Approach 1 (Row-wise Block-Jacobi): – Design: Explicitly extracts the n distinct r×r× r diagonal blocks of the full Hessian operator ℋH and factorizes them via Cholesky decomposition (LiLiTL_iL_i^T). – Focus: It specifically addresses the collinearity between the r rank-one components (a common issue in CP decomposition) while also incorporating the RKHS kernel and the missing data geometry. – Cost: Demands a heavier setup phase: (n2r2)O(n^2r^2) to construct the blocks and (nr3)O(nr^3) to factorize them. • Approach 2 (Kernel Preconditioner P=Ir⊗KP=I_r K): – Design: Preconditions purely with the RKHS kernel matrix. – Focus: It mathematically addresses the eigenvalue decay typical of many RKHS kernels, which can help bound the condition number. However, it completely ignores the spatial collinearity of the CP components and the missing data mask. – Cost: Effectively zero setup time. 2.3. PCG Loop Mechanics & Krylov Tracking How the updates are applied within the Krylov subspace loop shows a trade-off between numerical stability and algebraic optimization. • Approach 1 (Standard PCG): – Executes a standard, unconditionally stable PCG algorithm. – To evaluate the residual, it requires two dense matrix multiplications by K per iteration: U=KPkU=KP_k and Vk=KY+λUV_k=KY+λ U. • Approach 2 (Inverse-Free Tracking): – Standard PCG would require computing K−1K^-1 for its chosen preconditioner—an (n3)O(n^3) operation that is numerically disastrous for nearly singular kernels. Approach 2 instead uses a brilliant “inverse-free” algebraic trick. By analytically tracking pseudo-residuals (Vk=KDkV_k=KD_k and Z~k=KZk Z_k=KZ_k), the K−1K^-1 inversion perfectly cancels out. – This elegant tracking reduces the bottleneck to just one dense kernel multiplication per iteration (Mk=KUkM_k=KU_k). – Drawback: Implicitly tracking variables via recurrence relations accumulates floating-point drift over time, forcing the algorithm to periodically “refresh” its state. 2.4. Complexity & Performance Summary Metric Approach 1 (Pre-Aggregated) Approach 2 (Inverse-Free) Setup Cost (qdr+qr2++)O(qdr+qr^2+n^2r^2+nr^3) (qdr+)O(qdr+n^2r) (Faster Setup) Iteration Cost (n2r+)O(n^2r+nr^2) (Independent of q) (n2r+)O(n^2r+qr) (Slower Iterations) Dense K Mults. 2 per iteration 1 per iteration Preconditioner Targets CP rank collinearity Targets Kernel spectral decay 2.5. Final Verdict Approach 1 (Pre-Aggregated) is practically superior for large-scale, real-world datasets. By shifting the computational burden to the setup phase (computing E(i)E^(i)), it achieves an iteration cost that is entirely independent of the dataset size q. If your dataset has millions of observations, Approach 2 will bottleneck hard. Furthermore, its Block-Jacobi preconditioner is a much more robust choice for CP tensor models, meaning it will likely require far fewer total iterations to converge. Approach 2 (Inverse-Free) is mathematically elegant and better suited for lightweight setups or huge ranks. Its “inverse-free” tracking is a beautiful piece of numerical linear algebra that bounds the kernel’s condition number without requiring any (n3)O(n^3) matrix factorizations or explicit inversions. It is highly advantageous if memory is critically constrained, setup time must be strictly minimized, or the CP rank r is so large that Approach 1’s (nr3)O(nr^3) Cholesky factorizations become computationally prohibitive. 3. Approach 1: Pre-Aggregated Geometry & Block-Jacobi Preconditioner 3.1. Pre-computation and Data Setup To strictly avoid (M)O(M) operations, we completely abandon the explicit formulation of Z. The m-th observation only requires its corresponding row in the Khatri-Rao product, z(m)=(Zjm,:)T∈ℝrz^(m)=(Z_j_m,:)^T ^r. This vector is computed cleanly as the Hadamard product of the respective rows of the d−1d-1 fixed factor matrices in (dr)O(dr) time. We precompute these q vectors in (qdr)O(qdr) time, bypassing the ambient dimension M. We capture the unaligned data geometry by defining n independent symmetric matrices E(i)∈ℝr×rE^(i) ^r× r corresponding to the n slices of mode k. Let Ωi=m∈Ω∣im=i _i=\m∈ i_m=i\ be the set of observations falling in the i-th slice. We construct: E(i)=∑m∈Ωiz(m)(z(m))T,for i=1…n.E^(i)= _m∈ _iz^(m)(z^(m))^T, i=1… n. (3) The RHS matrix C∈ℝn×rC ^n× r, such that vec(C)=cvec(C)=c, is computed completely sparsely. Since the tensor unfolding T has missing entries set to zero, Bi,:=∑j=1MTi,jZj,:=∑m∈Ωiym(z(m))TB_i,:= _j=1^MT_i,jZ_j,:= _m∈ _iy_m(z^(m))^T. We compute B in (qr)O(qr) time and evaluate C=KBC=KB in (n2r)O(n^2r) time. 3.2. Exact Matrix-Vector Product (MVP) avoiding (N)O(N) During PCG, we must map an intermediate matrix W∈ℝn×rW ^n× r to a residual mapping V∈ℝn×rV ^n× r such that vec(V)=ℋvec(W)vec(V)=Hvec(W). Theorem 1 (Implicit Operator Action). For any W∈ℝn×rW ^n× r, the mapping V∈ℝn×rV ^n× r such that vec(V)=ℋvec(W)vec(V)=Hvec(W) evaluates exactly as: V=KY+λU,V=KY+λ U, (4) where U=KW∈ℝn×rU=KW ^n× r and the i-th row of Y∈ℝn×rY ^n× r is uniquely determined by Yi,:=Ui,:E(i)Y_i,:=U_i,:E^(i). This requires strictly (n2r+nr2)O(n^2r+nr^2) time, completely independent of q,Mq,M, and N. Proof. By the Kronecker-vector identity vec(AXB)=(BT⊗A)vec(X)vec(AXB)=(B^T A)vec(X), applying the first term evaluates as (Z⊗K)vec(W)=vec(KWZT)=vec(UZT)(Z K)vec(W)=vec(KWZ^T)=vec(UZ^T). The operator SST∈ℝN×NSS^T ^N× N is exactly a sparse diagonal projection mask spanning the unaligned data entries. When applied to vec(UZT)vec(UZ^T), it zeros out all unobserved tensor entries. Let the unvectorized masked matrix be F∈ℝn×MF ^n× M. Its elements are identically zero everywhere except at the q observed multi-indices, where they evaluate to: Fim,jm=(UZT)im,jm=Uim,:Zjm,:T=Uim,:z(m).F_i_m,j_m=(UZ^T)_i_m,j_m=U_i_m,:Z_j_m,:^T=U_i_m,:z^(m). Next, applying the left operator (Z⊗K)T=(ZT⊗K)(Z K)^T=(Z^T K) yields vec(KFZ)vec(KFZ). Let Y=FZ∈ℝn×rY=FZ ^n× r. Because F is sparse, the i-th row of Y expands strictly over the non-zeros in the i-th slice: Yi,:=∑j=1MFi,jZj,:=∑m∈ΩiFim,jmZjm,:=∑m∈Ωi(Ui,:z(m))(z(m))T=Ui,:∑m∈Ωiz(m)(z(m))T=Ui,:E(i).Y_i,:= _j=1^MF_i,jZ_j,:= _m∈ _iF_i_m,j_mZ_j_m,:= _m∈ _i (U_i,:z^(m) )(z^(m))^T=U_i,: _m∈ _iz^(m)(z^(m))^T=U_i,:E^(i). Finally, multiplying by K completes the main term yielding vec(KY)vec(KY). The regularization term simplifies seamlessly: λ(Ir⊗K)vec(W)=vec(λU)λ(I_r K)vec(W)=vec(λ U). Summing the components validates V=KY+λUV=KY+λ U. □ 3.3. Preconditioner Design: Row-wise Block-Jacobi Theorem 2 (Exact Block-Diagonal Operator). Let M(i)∈ℝr×rM^(i) ^r× r denote the exact i-th diagonal block of the Hessian operator ℋH acting linearly on the i-th row of W (represented as a column vector). It evaluates exactly as: M(i)=∑l=1nKi,l2E(l)+λKi,iIr.M^(i)= _l=1^nK_i,l^2E^(l)+λ K_i,iI_r. (5) Since E(l)⪰0E^(l) 0, Ki,l2≥0K_i,l^2≥ 0, and RKHS kernels satisfy Ki,i≥0K_i,i≥ 0, the resultant blocks are positive semi-definite, and symmetric positive definite for any λ>0λ>0, allowing for computation of the Cholesky-like factorization M(i)=LiLiTM^(i)=L_iL_i^T. The sum ∑lKi,l2E(l) _lK_i,l^2E^(l) can be rapidly evaluated in (n2r2)O(n^2r^2) operations via flattened dense matrix multiplication. Algorithm 1: PCG for Unaligned RKHS Mode-k Subproblem (Approach 1) 1: Initialize Setup: Calculate ZΩ∈ℝq×rZ_ ^q× r, E(i)i=1n\E^(i)\_i=1^n, and C=KB∈ℝn×rC=KB ^n× r. 2: Preconditioner: Construct M(i)M^(i) via flat multiplication, and compute decomposition LiLiT=M(i)L_iL_i^T=M^(i) for i=1…ni=1… n. 3: W0=n×rW_0=0_n× r, R0=CR_0=C, and Z0∈ℝn×rZ_0 ^n× r. 4: for i=1…ni=1… n do 5: Solve LiLiT(Z0)i,:T=(R0)i,:TL_iL_i^T(Z_0)_i,:^T=(R_0)_i,:^T ⊳ Apply Preconditioner Block-wise 6: end for 7: P0=Z0P_0=Z_0 8: for k=0,1,2,…k=0,1,2,… until ‖Rk‖F<τ\|R_k\|_F<τ do 9: U=KPkU=KP_k 10: Compute Yi,:=Ui,:E(i)Y_i,:=U_i,:E^(i) for all i=1…ni=1… n 11: Vk=KY+λUV_k=KY+λ U ⊳ Exact fast MVP defined in Theorem 1 12: αk=Tr(RkTZk)/Tr(PkTVk) _k=Tr(R_k^TZ_k)/Tr(P_k^TV_k) 13: Wk+1=Wk+αkPkW_k+1=W_k+ _kP_k 14: Rk+1=Rk−αkVkR_k+1=R_k- _kV_k 15: for i=1…ni=1… n do 16: Solve LiLiT(Zk+1)i,:T=(Rk+1)i,:TL_iL_i^T(Z_k+1)_i,:^T=(R_k+1)_i,:^T 17: end for 18: βk=Tr(Rk+1TZk+1)/Tr(RkTZk) _k=Tr(R_k+1^TZ_k+1)/Tr(R_k^TZ_k) 19: Pk+1=Zk+1+βkPkP_k+1=Z_k+1+ _kP_k 20: end for 21: return Wk+1W_k+1 4. Approach 2: On-the-fly Sparse Accumulation & Kernel Preconditioner 4.1. Algebraic Reformulation of the Linear System The linear system to solve for W∈ℝn×rW ^n× r is ℋvec(W)=bHvec(W)=b. Using the mixed-product property of Kronecker products, (A⊗B)(C⊗D)=(AC)⊗(BD)(A B)(C D)=(AC) (BD), we can factor Z⊗K=(Z⊗In)(Ir⊗K)Z K=(Z I_n)(I_r K). Let P=Ir⊗KP=I_r K. Substituting this factorization and setting Hred=(Z⊗In)TSST(Z⊗In)H_red=(Z I_n)^TS^T(Z I_n), we seamlessly rewrite the exact system as: (PHredP+λP)vec(W)=Pvec(B)(PH_redP+λ P)vec(W)=Pvec(B) (6) 4.2. Method and Choice of Preconditioner We select P=Ir⊗KP=I_r K as our preconditioner. Without preconditioning, the system matrix can be ill-conditioned, especially for certain RKHS kernels with decaying eigenvalues. By preconditioning with P, the effective operator is normalized to P1/2HredP1/2+λInrP^1/2H_redP^1/2+λ I_nr. The condition number becomes mathematically bounded regardless of the kernel spectrum: κ≤λ+λmax(Hred)λmax(K)λ=1+λmax(Hred)λmax(K)λκ≤ λ+ _ (H_red) _ (K)λ=1+ _ (H_red) _ (K)λ (7) The “Inverse-Free” Tracking Technique: Standard PCG evaluates zk=P−1rkz_k=P^-1r_k at every iteration, seemingly requiring an intractable (n3)O(n^3) inversion of K. However, note that the right-hand side b=Pvec(B)b=Pvec(B) is in the range of P, and the operator P(HredP+λI)P(H_redP+λ I) always maps vectors into the range of P. By induction, the residual rkr_k intrinsically factors as rk=Pr^kr_k=P r_k. Therefore, the preconditioned residual is exactly zk=r^kz_k= r_k. By analytically updating r^k r_k instead of rkr_k, P−1P^-1 perfectly algebraically cancels out. 4.3. Matrix-Free Matrix-Vector Products (Sparse Operations) We evaluate U=unvec(Hredvec(V))U=unvec(H_redvec(V)) in (qr)O(qr) time by bypassing N and M. 1. Apply (Z⊗In)(Z I_n): Conceptually expands the model to the full unaligned grid. 2. Apply Sparse Selection STS^T: Extract the q observed entries. For observation m, the predicted value is (VZT)im,jm=⟨Vim,:,zm⟩(VZ^T)_i_m,j_m= V_i_m,:,z_m . We compute these q scalars eme_m. 3. Apply Adjoint S and (ZT⊗In)(Z^T I_n): The output U sparsely accumulates the entries where the mode-k index matches i: Ui,:=∑m:im=iemzmU_i,:= _m:i_m=ie_mz_m. Algorithm 2: Complete Inverse-Free PCG Algorithm (Approach 2) 1: Setup Phase: 2: Pre-extract ZΩ∈ℝq×rZ_ ^q× r using Khatri-Rao rules. 3: Initialize RHS state with q known tensor values ymy_m: B∈ℝn×rB ^n× r where Bi,:=∑m:im=iymzmB_i,:= _m:i_m=iy_mz_m. 4: Initialize: W0=W_0=0, Z0=BZ_0=B, D0=BD_0=B. Compute Z~0=KB Z_0=KB, and let V0=Z~0V_0= Z_0. 5: for k=0,1,…k=0,1,… until convergence do 6: Sparse MVP ((qr)O(qr)): 7: em=⟨(Vk)im,:,zm⟩e_m= (V_k)_i_m,:,z_m for m=1…qm=1… q 8: Initialize Uk=n×rU_k=0_n× r. Accumulate (Uk)im,:+=emzm(U_k)_i_m,: +=e_mz_m 9: Compute Operator Action ((nr)O(nr)): 10: Qk=Uk+λDkQ_k=U_k+λ D_k 11: Step Size ((nr)O(nr)): 12: αk=Tr(ZkTZ~k)Tr(VkTQk) _k= Tr(Z_k^T Z_k)Tr(V_k^TQ_k) 13: Update Estimates ((nr)O(nr)): 14: Wk+1=Wk+αkDkW_k+1=W_k+ _kD_k 15: Zk+1=Zk−αkQkZ_k+1=Z_k- _kQ_k 16: Update Conjugation Maps ((n2r)O(n^2r)): 17: Compute Mk=KUkM_k=KU_k ⊳ Only dense n×n× n multiplication required 18: Z~k+1=Z~k−αk(Mk+λVk) Z_k+1= Z_k- _k(M_k+λ V_k) 19: Update Directions ((nr)O(nr)): 20: βk=Tr(Zk+1TZ~k+1)Tr(ZkTZ~k) _k= Tr(Z_k+1^T Z_k+1)Tr(Z_k^T Z_k) 21: Dk+1=Zk+1+βkDkD_k+1=Z_k+1+ _kD_k 22: Vk+1=Z~k+1+βkVkV_k+1= Z_k+1+ _kV_k ⊳ Tracks KDk+1KD_k+1 rigorously 23: end for 24: (Note: Every 50 iterations, explicitly refresh Z~k=KZk Z_k=KZ_k and Vk=KDkV_k=KD_k to clear drift).