Trellis formalizes the Strong Perfect Graph Theorem autonomously in 6 weeks — 540k lines of Lean, the largest yet

littmath · x · 2026-09-03

Trellis has formalized the Strong Perfect Graph Theorem of Chudnovsky, Robertson, Seymour and Thomas (Annals of Mathematics, 2006). The system ran autonomously for 6 weeks, producing a 540k-line proof — the largest Lean autoformalization to date. The original paper, viewer, and git repo are all public.

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