Claude formalizes Fermat's Last Theorem in 11 days, producing 13M lines of Lean
GregCook2011 · x · 2026-09-05
Anthropic announced that Claude completed the first fully formalized proof of Fermat's Last Theorem — converting Andrew Wiles' 1995 proof into a machine-checkable Lean proof, a task experts expected to take years.
Key facts:
- The proof spans over 13 million lines of Lean code, the largest Lean proof ever written;
- It proves and depends on roughly 29,500 intermediate theorems;
- Dozens of Claude agents worked in parallel to fill in missing logical details as Lean code, finishing in 11 days;
- Lean successfully verified the final proof.
The significance: AI can now automate the painstaking work of turning advanced human mathematics into machine-checkable form, potentially unlocking large-scale formalization.
Related event: Claude Produces First Formalized Proof of Fermat's Last Theorem in 11 Days(52 posts)→
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