Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
ea22ef4485
This ports the `.below` and `.brecOn` constructions to lean. I kept them in the same file, as they were in the C code, because they are highly coupled and the constructions are very analogous. For validation I developed this in a separate repository at https://github.com/nomeata/lean-constructions/tree/fad715e and checked that all declarations found in Lean and Mathlib are equivalent, up to def canon (e : Expr) : CoreM Expr := do Core.transform (← Core.betaReduce e) (pre := fun | .const n ls => return .done (.const n (ls.map (·.normalize))) | .sort l => return .done (.sort l.normalize) | _ => return .continue) It was not feasible to make them completely equal, because the kernel's type inference code seem to optimize level expressions a bit less aggressively, and beta-reduces less in inference. The private helper functions about `PProd` can later move into their own file, used by these constructions as well as the structural recursion module. |
||
|---|---|---|
| .github | ||
| doc | ||
| images | ||
| nix | ||
| releases_drafts | ||
| script | ||
| src | ||
| stage0 | ||
| tests | ||
| .gitattributes | ||
| .gitignore | ||
| .ignore | ||
| CMakeLists.txt | ||
| CMakePresets.json | ||
| CODEOWNERS | ||
| CONTRIBUTING.md | ||
| flake.lock | ||
| flake.nix | ||
| lean-toolchain | ||
| lean.code-workspace | ||
| LICENSE | ||
| LICENSES | ||
| README.md | ||
| RELEASES.md | ||
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 (documentation source: doc/make/index.md).