Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
Loose fvars are never supposed to be pretty printed, but having them print with "fvar" in the name can help with debugging broken tactics and elaborators. Metaprogramming users often do not realize at first that `_uniq.???` in pretty printing output refers to fvars not in the current local context. |
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This is the repository for Lean 4.
About
- Quickstart
- Homepage
- Theorem Proving Tutorial
- Functional Programming in Lean
- Manual
- Release notes starting at v4.0.0-m3
- Examples
- External Contribution Guidelines
- FAQ
Installation
See Setting Up Lean.
Contributing
Please read our Contribution Guidelines first.
Building from Source
See Building Lean.