Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
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This is the repository for Lean 4, which is currently being released as milestone releases towards a first stable release. Lean 3 is still the latest stable release.
About
- Quickstart
- Homepage
- Theorem Proving Tutorial
- Manual
- Release notes starting at v4.0.0-m3
- FAQ
Installation
See Setting Up Lean.
Supported Platforms
Tier 1
Platforms built & tested by our CI, available as nightly & stable releases via elan (see above)
- x86-64 Linux with glibc 2.27+
- x86-64 macOS 10.15+
- x86-64 Windows 10+
Tier 2
Platforms cross-compiled but not tested by our CI, available as nightly & stable releases
Releases may be silently broken due to the lack of automated testing. Issue reports and fixes are welcome.
- aarch64 Linux with glibc 2.27+
Tier 3
Platforms that are known to work from manual testing, but do not come with CI or official releases
- aarch64 (M1) macOS - may also use x86-64 releases via Rosetta
Contributing
Please read our Contribution Guidelines first.
Building from Source
See Building Lean.