This is the repository for **Lean 4**, which is currently being released as milestone releases towards a first stable release.
[Lean 3](https://github.com/leanprover/lean) is still the latest stable release.

# 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://leanprover.github.io)
- [Theorem Proving Tutorial](https://leanprover.github.io/theorem_proving_in_lean4/)
- [Functional Programming in Lean](https://leanprover.github.io/functional_programming_in_lean/)
- [Manual](https://leanprover.github.io/lean4/doc/)
- [Release notes](RELEASES.md) starting at v4.0.0-m3
- [Examples](https://leanprover.github.io/lean4/doc/examples.html)
- [FAQ](https://leanprover.github.io/lean4/doc/faq.html)

# Installation

See [Setting Up Lean](https://leanprover.github.io/lean4/doc/setup.html).

# Contributing

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

# Building from Source

See [Building Lean](https://leanprover.github.io/lean4/doc/make/index.html).