Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
When using `set_option tactic.skipAssignedInstances false`, `simp` and `rw` will synthesize instance implicit arguments even if they have assigned by unification. If the synthesized argument does not match the assigned one the rewrite is not performed. This option has been added for backward compatibility. |
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This is the repository for Lean 4.
About
- Quickstart
- Homepage
- Theorem Proving Tutorial
- Functional Programming in Lean
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- Release notes starting at v4.0.0-m3
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Installation
See Setting Up Lean.
Contributing
Please read our Contribution Guidelines first.
Building from Source
See Building Lean.