leanprover/lean4
Lean 4 programming language and theorem prover
{ "createdAt": "2018-04-15T02:49:20Z", "defaultBranch": "master", "description": "Lean 4 programming language and theorem prover", "fullName": "leanprover/lean4", "homepage": "https://lean-lang.org", "language": "Lean", "name": "lean4", "pushedAt": "2025-11-26T02:07:28Z", "stargazersCount": 6777, "topics": [ "lean", "lean4" ], "updatedAt": "2025-11-26T02:07:31Z", "url": "https://github.com/leanprover/lean4"}This is the repository for Lean 4.
- Quickstart
- Homepage
- Theorem Proving Tutorial
- Functional Programming in Lean
- Documentation Overview
- Language Reference
- [Release notes]!(RELEASES.md) starting at v4.0.0-m3
- Examples
- [External Contribution Guidelines]!(CONTRIBUTING.md)
Installation
Section titled “Installation”See Install Lean.
Contributing
Section titled “Contributing”Please read our [Contribution Guidelines]!(CONTRIBUTING.md) first.
Building from Source
Section titled “Building from Source”See [Building Lean]!(doc/make/index.md).