This is the repository for Lean 4, which is being actively developed and published as nightly releases. Stable point releases are planned for a later date after establishing a robust release process.
- Quickstart
- Walkthrough installation video
- Quick tour video
- Homepage
- Theorem Proving Tutorial
- Functional Programming in Lean
- Manual
- Release notes starting at v4.0.0-m3
- Examples
- External Contribution Guidelines
- FAQ
See Setting Up Lean.
Please read our Contribution Guidelines first.
See Building Lean.