Claude formalizes Fermat's Last Theorem in Lean: 13M lines, 29,000 theorems
soumitrashukla9 · x · 2026-09-06
Anthropic announced that last month Claude completed the first formalized proof of Fermat's Last Theorem, converting it into Lean-verifiable form — a project experts expected to take many years. The proof spans over 13 million lines of code, the largest Lean proof ever written, and machine-verifies 29,000+ supporting theorems along the way.
Related event: Claude Produces First Formalized Proof of Fermat's Last Theorem in 11 Days(52 posts)→
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