anthropics/fermats-last-theorem
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A complete, machine-checked proof of Fermat's Last Theorem in Lean 4, built on Mathlib (Lean 4.33.1; Mathlib v4.33.0, pinned by commit in lakefile.lean). The argument is that of Frey, Serre, Ribet, Wiles and Taylor-Wiles. PROOF-PATH.md names each step and the Lean theorem that carries it, and the html/ folder presents the whole proof as web pages you can browse offline (see "Reading the proof in a browser" below). Research artifact. Not maintained and not accepting contributions. Theorems/Thmfermatlasttheorem.lean declares and the default build target FinalCheck.lean contains so the build fails unless the proof rests on exactly Lean's three standard axioms (no sorry, no added axiom, no nativedecide). FinalCheck.lean also derives Mathlib's own statement, FermatLastTheorem, from this theorem. Mathlib compiled from source. All 60,475 modules of this repository built, every declaration was checked by the Lean kernel, and the axioms are as above. verification/comparator/Challenge.lean, which states the theorem using only Mathlib. It…
Read the full README ↗ · Preview checked 2026-10-29T03:25:44.875Z
Inside the original README — Document outline
- Fermat's Last Theorem in Lean 4
- The statement
- How it was verified
- Reading the proof in a browser
- Check it yourself
- About the sources
- Licence and attribution
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Repository facts
- Owner
- anthropics
- Primary language
- Lean
- Stars
- 1,250
- Forks
- 106
- Open issues + pull requests
- 6
- License
- Apache-2.0
- Archived
- No
- Default branch
- main
- Created
- 2026-09-04T14:21:04.000Z
- Last push
- 2026-09-24T14:06:42.000Z
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