This is the repository for Lean 4, which is currently being released as milestone releases towards a first stable release. Lean 3 is still the latest stable release.
- Walkthrough installation video
- Quick tour video
- Theorem Proving Tutorial
- Functional Programming in Lean first chapter is available!
- Release notes starting at v4.0.0-m3
See Setting Up Lean.
Please read our Contribution Guidelines first.
Building from Source
See Building Lean.