Lean(@leanprover):@AnthropicAI has shared the first end-to-end, computer-checked proof of Fermat's Last Theorem: 13 million lines of Lean, 29,500 intermediate theorems. Their announcement calls it "the largest Lean proof ever constructed." See also Kevin Buzzard's blog post about the proof: https://t.co/lom08Euj3y 🔗 Anthropic's announce post: https://t.co/3N46u1GOtd 🔗 The code: https://t.co/ZiWpXiZBFM #LeanLang #LeanProver #FLT

Lean

@leanprover

Lean is a dependently-typed programming language and theorem prover.

Joined April 2018

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Lean@leanprover

2026.09.04 20:08

@AnthropicAI has shared the first end-to-end, computer-checked proof of Fermat's Last Theorem: 13 million lines of Lean, 29,500 intermediate theorems. Their announcement calls it "the largest Lean proof ever constructed." See also Kevin Buzzard's blog post about the proof: 🔗 Anthropic's announce post: 🔗 The code: #LeanLang# #LeanProver# #FLT#