Largest math proof in history verified: 15,000-page Classification of Finite Simple Groups fully formalized in Lean
stevenstrogatz · x · 2026-10-27
Axiom announced a complete Lean auto-formalization of the Classification of Finite Simple Groups (CFSG), the largest proof in human history — roughly 15,000 pages built by 100+ mathematicians over generations. Mathematician Ken Ono shared he was brought to tears: his late father introduced him to group theory, and CFSG defined his college years in the 80s. A major milestone for machine-verified mathematics.
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