Fermat's Last Theorem in Lean 4

github.com
September 4, 2026
2 min read
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Summary
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...
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