Anthropic says Claude completed the first formalized proof of Fermat's Last Theorem—over 13 million lines of Lean, the largest Lean proof ever written. It also formalized more than 29,000 supporting theorems, a major step for AI-assisted mathematical verification.

Key Takeaways

  • ✓Claude finished a formalization experts expected would take many years
  • ✓The Lean proof exceeds 13 million lines and covers 29,000+ supporting theorems
  • ✓Signals AI-assisted proof checking as a path to scale mathematical refereeing
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