`ComparatorChallenges/IndividualStrongInfiniteness.lean`

Explanation legend Lean4 Domain Explanation Language (L4DEL)

L4DEL explanations are a separate layer. They do not change the Lean source. Intuition is explanatory prose; numbered items are a reading path; sources link the wording back to evidence.

L4DEL: Lean4 Domain Explanation Language

Annotation provenance. This overlay contains 120 curated AI-written annotations and 1273 mechanical source-derived annotations. They have not been human-reviewed as explanations; treat them as unverified and not mathematical authority. Retained generation history: The 9 original curated annotations were produced in a Claude Sonnet 5.5 session at medium effort; Claude Opus 5.5 is recorded in that session as the advisor model, not the direct author. Those 9 annotations were revised on 2026-10-14 to bind all of them to exact page-one quotations from 6 pinned OpenAI manuscripts, the matching pinned formalization notes, and named historical primary sources; no human review is claimed, and the exact runtime model identifier was not exposed to the artifact generator. The 3 manuscript-grounded matrix-multiplication annotations were composed from pinned OpenAI manuscripts and named historical sources in a Codex session on 2026-10-14; no human review is claimed, and the exact runtime model identifier was not exposed to the artifact generator. Six additional target-specific annotations for Catalan's constant, the irrationality exponent of pi, dyadic Erdos similarity, Unique Games, quintic Lienard systems, and Yau nodal growth were composed from pinned OpenAI manuscripts, exact page-one quotations, exact Lean statements, and named historical sources in a Codex session on 2026-10-14; no human review is claimed, and the exact runtime model identifier was not exposed to the artifact generator. Four additional target-specific annotations for Seymour's second-neighborhood conjecture, Cannon's conjecture, Koebe circle-domain uniformization, and circle-domain rigidity were composed from 4 pinned OpenAI manuscripts, exact page-one quotations, exact Lean statements, and named historical primary sources in a Codex session on 2026-10-14; no human review is claimed, and the exact runtime model identifier was not exposed to the artifact generator. Four additional target-specific annotations for simple Lebesgue spectrum on the three-torus, Rokhlin multiple mixing, the nine-dimensional Borsuk counterexample, and Tingley's sphere-isometry problem were composed from 4 pinned OpenAI manuscripts, exact page-one quotations, exact Lean statements, and named historical primary sources in a Codex session on 2026-10-14; no human review is claimed, and the exact runtime model identifier was not exposed to the artifact generator. Four additional target-specific annotations for the Abhyankar-Sathaye counterexample, the circulant Hadamard conjecture, the Eilenberg-Ganea counterexample, and short Egyptian fractions were composed from 4 pinned OpenAI manuscripts, exact page-one quotations, exact Lean statements, and quotations from Sathaye, Turyn with Storer, Eilenberg with Ganea, and Erdos in a Codex session on 2026-10-14; no human review is claimed, and the exact runtime model identifier was not exposed to the artifact generator. Four additional target-specific annotations for the complete Crouzeix inequality, unrestricted Euclidean five-coloring, the general Mahler conjecture, and Thompson F nonamenability were composed on 2026-10-14 from exact Lean statements, 4 pinned OpenAI manuscripts, the matching formalization notes, and linked historical sources by Crouzeix, de Grey, Mahler, Cannon, Floyd, and Parry; no human review is claimed. Four additional target-specific annotations for algorithmic strong thin trees, Barnette's Hamiltonian-cycle conjecture, the explicit Artin CAT(0) counterexample, and generalized amplitude-damping capacity were composed on 2026-10-14 from exact Lean statements, 4 pinned OpenAI manuscripts, matching formalization notes, and linked historical sources by Anari with Goddyn, Arts with Hopman and Timmermans, Charney, and Khatri with Sharma and Wilde; no human review is claimed. Fourteen solution-level annotations for Seymour's second-neighborhood theorem were added on 2026-10-14 from the pinned 15-page manuscript, covering the exact-neighborhood model, minimal-counterexample reduction, subset deficit, transitive blowup, pruning, extremal contradiction, and proof-bearing final theorem. The subset and blowup annotations also bind exact quotations from Tyler Seacrest (2019) and Brantner, Brockman, Kay, and Snively (2009); no human review is claimed. Thirty-seven declaration-level annotations were added on 2026-10-14 for the rest of ComparatorChallenges/AlgorithmicThinTrees.lean, covering its multigraph semantics, stack-machine cost model, explicit and binary-multiplicity encodings, output certificate, and complete algorithmic proposition. They are bound to the pinned OpenAI manuscript and linked earlier thin-tree sources by Luis Goddyn, Nima Anari, and Shayan Oveis Gharan; the annotation explicitly preserves that the concluding comparator theorem still has body by sorry, and no human review is claimed. Thirty-one supporting declarations in ComparatorChallenges/UniqueGamesTheorem.lean were upgraded or added on 2026-10-14, completing curated coverage of all thirty-two declarations in that file. The annotations cover the finite game model, Boolean formula and parser, binary-vector translations, explicit output serialization, finite-alphabet machine contract, and gap theorem; they distinguish manuscript-backed mathematics from Lean-specific canonical parsing and unary game output encoding, bind exact OpenAI manuscript quotations, and credit Subhash Khot through his 2010 survey. The comparator theorem remains explicitly labeled as having body by sorry; no human review is claimed. The source-derived generator was hardened on 2026-10-14 so a formalization note covering multiple comparator results no longer copies its combined Scope prose onto each declaration; those targets now use declaration-specific source comments when available and otherwise remain explicitly bounded to the exact Lean statement. The remaining source-derived annotations were generated mechanically from pinned formalization notes and source comments by tooling developed in a GPT-5.6 Sol session at ultra reasoning; GPT-5.6 Sol did not originate the source prose.

Credit: OpenAI's pinned repository says an unreleased internal model produced the manuscripts and supporting proof artifacts. The collection builds on the mathematics community's accumulated problems, results, language, and formal libraries; each manuscript's BibTeX and bibliography are the authority for individual scholarly credit.

Project sources: Pinned openai/math documentation, Pinned formalization catalogue

53 declarations, 1 contain sorry, 0 declared as axioms

def OAI.MainGap.scalarCorner line 14
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Comparison.lean:21 (same declaration text).
def OAI.MainGap.doubleCorner line 17
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Comparison.lean:24 (same declaration text).
def OAI.MainGap.Diagonalization line 20
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Comparison.lean:33 (same declaration text).
def OAI.MainGap.UnrestrictedDiagonalization line 26
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Comparison.lean:39 (same declaration text).
def OAI.MainGap.StronglyPurelyInfinite line 30
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Comparison.lean:43 (same declaration text).
abbrev OAI.MainGap.Stable.Mat line 44
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:14 (same declaration text).
def OAI.MainGap.Stable.pad line 46
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:16 (same declaration text).
lemma OAI.MainGap.Stable.pad_entry line 50
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:20 (same declaration text).
lemma OAI.MainGap.Stable.pad_apply line 53
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:23 (same declaration text).
lemma OAI.MainGap.Stable.sum_pad line 56
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:26 (same declaration text).
lemma OAI.MainGap.Stable.pad_mul line 72
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:42 (same declaration text).
def OAI.MainGap.Stable.padHom line 86
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:56 (same declaration text).
lemma OAI.MainGap.Stable.pad_injective line 94
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:64 (same declaration text).
lemma OAI.MainGap.Stable.norm_pad line 100
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:70 (same declaration text).
lemma OAI.MainGap.Stable.pad_self line 103
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:73 (same declaration text).
lemma OAI.MainGap.Stable.pad_pad line 107
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:77 (same declaration text).
instance OAI.MainGap.Stable.pad_directedSystem line 118
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:88 (same declaration text).
abbrev OAI.MainGap.Stable.Algebraic line 122
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:92 (same declaration text).
instance OAI.MainGap.Stable.(instance at line 130) line 130
instance OAI.MainGap.Stable.(instance at line 132) line 132
lemma OAI.MainGap.Stable.norm_mk line 135
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:105 (same declaration text).
lemma OAI.MainGap.Stable.normedCore line 138
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:108 (same declaration text).
instance OAI.MainGap.Stable.(instance at line 155) line 155
instance OAI.MainGap.Stable.(instance at line 156) line 156
instance OAI.MainGap.Stable.(instance at line 157) line 157
instance OAI.MainGap.Stable.(instance at line 162) line 162
def OAI.MainGap.Stable.cornerAlg line 167
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:137 (same declaration text).
lemma OAI.MainGap.Stable.cornerAlg_apply line 171
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:141 (same declaration text).
lemma OAI.MainGap.Stable.cornerAlg_isometry line 174
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:144 (same declaration text).
abbrev OAI.MainGap.Stable.Stabilization line 177
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:147 (same declaration text).
instance OAI.MainGap.Stable.(instance at line 185) line 185
lemma OAI.MainGap.Stable.coe_mul_stable line 189
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:159 (same declaration text).
instance OAI.MainGap.Stable.(instance at line 194) line 194
instance OAI.MainGap.Stable.(instance at line 202) line 202
instance OAI.MainGap.Stable.(instance at line 218) line 218
instance OAI.MainGap.Stable.(instance at line 224) line 224
lemma OAI.MainGap.Stable.coe_star_stable line 226
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:196 (same declaration text).
instance OAI.MainGap.Stable.(instance at line 230) line 230
instance OAI.MainGap.Stable.(instance at line 233) line 233
instance OAI.MainGap.Stable.(instance at line 245) line 245
instance OAI.MainGap.Stable.(instance at line 250) line 250
instance OAI.MainGap.Stable.(instance at line 259) line 259
instance OAI.MainGap.Stable.(instance at line 268) line 268
def OAI.MainGap.Stable.stabilizationCStarAlgebra line 276
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:246 (same declaration text).
def OAI.MainGap.Stable.corner line 278
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:248 (same declaration text).
lemma OAI.MainGap.Stable.corner_apply line 286
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:256 (same declaration text).
lemma OAI.MainGap.Stable.norm_corner line 289
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:259 (same declaration text).
lemma OAI.MainGap.Stable.corner_isometry line 292
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:262 (same declaration text).
lemma OAI.MainGap.Stable.corner_pad line 295
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Stabilization.lean:265 (same declaration text).
def OAI.MainGap.Manuscript.CuntzLE line 308
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Main.lean:15 (same declaration text).
def OAI.MainGap.Manuscript.ProperlyInfinite line 312
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Main.lean:19 (same declaration text).
def OAI.MainGap.Manuscript.PropertyP line 316
Also declared: OAI/Analysis/CStarAlgebra/PureInfiniteness/Main.lean:23 (same declaration text).
theorem OAI.MainGap.Manuscript.individual_to_strong_main Challenge statement: Individual proper infiniteness implies strong pure infiniteness sorry line 319
L4DEL explanation
This declaration is an exact comparator-selected statement. Read the Lean statement below for its mathematical content.
1. The linked formalization note covers 2 distinct comparator results, so its combined Scope prose is not copied onto this declaration.
2. The repository's comparator configuration selects OAI.Analysis.CStarAlgebra.PureInfiniteness.Main as the released solution module checked against this declaration.
Sources and attribution: Pinned Lean source (fd4aeeb2ee4f)
Distinct definitions of this name: OAI/Analysis/CStarAlgebra/PureInfiniteness/Main.lean:43 (same statement text; different proof or body). Qualify references as OAI.MainGap.Manuscript.individual_to_strong_main@path.
```
theorem individual_to_strong_main (hP : PropertyP A) :
    (∀ a b : A, 0 ≤ a → 0 ≤ b → ∀ c : A, ∀ ε : ℝ, 0 < ε →
      ∃ s t : A,
        ‖star s * a * s - a‖ < ε ∧
        ‖star t * b * t - b‖ < ε ∧
        ‖star s * c * t‖ < ε) ∧
    MainGap.StronglyPurelyInfinite A := by
…
```
Mentions: OAI.MainGap.Manuscript.PropertyP, OAI.MainGap.StronglyPurelyInfinite