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Connected bipartite graphs of degeneracy exactly r with ex(n,H) ≥ c·n^(2−1/r+1/(28r²)), refuting the Erdős–Simonovits degeneracy conjecture (Erdős problem #146) for every r ≥ 2, with the exact limits of the method. Machine-checked in Lean 4.
Plectis by Will Cook: an open-source prototype for mathematical exposition and collaborative research. Eight Erdős programmes, short and long papers, Lean proofs, cross-problem mathematics and reusable infrastructure, with explicit sources, evidence and contribution credit.
Plectis: Lean research on Erdős problems. Read it at wcook04.github.io/plectis. This repository holds the website source and the earlier Python toolkit; the Lean proofs are in wcook04/plectis-erdos.
A source-linked index of open math problems solved, refuted, or settled with AI — tracking the July 2026 wave. Verification-status badges, Lean/DRAT certificates, priority caveats.
Preprint series on fractional and integral clique partitions, chordal graphs and quantitative stability, with bilingual manuscripts, Lean 4 formalizations and audit evidence.
A continuously re-verified ledger of mathematical records. Mirrors published bounds and constants, re-checks them daily, and goes red when a cited record moves.