| 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/) **first chapter is available!** | |
| - [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). |