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Morning Edition · Wednesday, September 9, 2026Published at 2:20 AM EDT · New York
Anthropic Says Claude Produced the First Machine-Checked Proof of Fermat's Last Theorem in Eleven Days
Anthropic says the run wrote 13 million lines of Lean and proved about 29,500 supporting theorems, work a funded human project had scheduled through 2029.
Anthropic published on September 4 that Claude, working largely without human intervention over 11 days, completed the first end-to-end formalization of Fermat's Last Theorem in Lean. This is not a new theorem. Andrew Wiles proved it in the…
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Part of a tracked trend
Formal Verification Becomes the Trust Layer for AI Output
As models generate more mathematics and code than humans can review, machine-checkable artifacts become the accepted proof of correctness, and demand shifts toward domains where an automated checker exists.
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