leanprover / lean4

Lean 4 programming language and theorem prover

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This is the repository for **Lean 4**. About • Quickstart • Homepage • Theorem Proving Tutorial • Functional Programming in Lean • Documentation Overview • Language Reference • Release notes starting at v4.0.0-m3 • Examples • External Contribution Guidelines Installation See Install Lean. Contributing Please read our Contribution Guidelines first. Building from Source See Building Lean.