Full Lean formalization of finite simple groups classification, a 15,000-page proof
Zulfikar_Ramzan · x · 2026-10-28
Kevin Weil announces a complete Lean formalization of the classification of finite simple groups — originally 15,000 pages of work across 500 papers by 100 mathematicians. The result is now settled beyond doubt, with commenters calling it a 'slowly, then all at once' moment for formal mathematics.
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