This is the repository for **Lean 4**.

We provide [nightly releases](https://github.com/leanprover/lean4-nightly/releases)
and have just begun regular [stable point releases](https://github.com/leanprover/lean4/releases).

# About

- [Quickstart](https://github.com/leanprover/lean4/blob/master/doc/quickstart.md)
- [Walkthrough installation video](https://www.youtube.com/watch?v=yZo6k48L0VY)
- [Quick tour video](https://youtu.be/zyXtbb_eYbY)
- [Homepage](https://lean-lang.org)
- [Theorem Proving Tutorial](https://lean-lang.org/theorem_proving_in_lean4/)
- [Functional Programming in Lean](https://lean-lang.org/functional_programming_in_lean/)
- [Manual](https://lean-lang.org/lean4/doc/)
- [Release notes](RELEASES.md) starting at v4.0.0-m3
- [Examples](https://lean-lang.org/lean4/doc/examples.html)
- [External Contribution Guidelines](CONTRIBUTING.md)
- [FAQ](https://lean-lang.org/lean4/doc/faq.html)

# Installation

See [Setting Up Lean](https://lean-lang.org/lean4/doc/setup.html).

# Contributing

Please read our [Contribution Guidelines](CONTRIBUTING.md) first.

# Building from Source

See [Building Lean](https://lean-lang.org/lean4/doc/make/index.html).