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2 stars written in Lean
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Lean 4 programming language and theorem prover

Lean 6,923 717 Updated Dec 18, 2025

Lean 3 material for Kevin Buzzard's 2021 TCC courrse on formalising mathematics. Lean 4 version available here: https://github.com/ImperialCollegeLondon/formalising-mathematics-2024

Lean 313 21 Updated Mar 9, 2024