Claude formalizes Fermat's Last Theorem: 13M-line Lean proof, the largest ever
xennygrimmato_ · x · 2026-09-05
Anthropic announced that Claude last month completed the first formalized proof of Fermat's Last Theorem — a project experts expected to take years, and the largest Lean proof ever written at over 13 million lines of code.
Key facts:
- The theorem was originally proven by Sir Andrew Wiles in 1995, over 350 years after it was conjectured
- Formalization converts mathematical reasoning into machine-checkable form for proof assistants like Lean
- The proof also formalizes over 29,000 prerequisite theorems it depends on
A landmark showing formalized mathematics moving from assisted tooling to independently completing major mathematical engineering.
Related event: Claude Produces First Formalized Proof of Fermat's Last Theorem in 11 Days(52 posts)→
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