Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
cf3b257ccd
This PR cleans up the `Option` development, upstreaming some results from mathlib in the process. Notable changes: - the name `<op>_eq_some_iff` is preferred over `<op>_eq_some` - the `simp` normal form for `<$>` is `Option.map`, for `>>=` is `Option.bind` and for `<|>` is `Option.orElse` (for the former two, this was already true before this PR). All further lemmas about these operations are now stated only in terms of `Option.map`/`Option.bind`/`Option.orElse`. Previously, in some cases both versions were available, with a prime used to disambiguate (the primed version was usually the "non-ascii-art" version). Now, there are no lemmas about the ascii-art versions besides the ones turning them into the non-ascii-art operations, and there is only one version of every lemma, about the non-ascii-art operation, and named without a prime. |
||
|---|---|---|
| .github | ||
| doc | ||
| images | ||
| nix | ||
| releases_drafts | ||
| script | ||
| src | ||
| stage0 | ||
| tests | ||
| .gitattributes | ||
| .gitignore | ||
| .gitpod.Dockerfile | ||
| .gitpod.yml | ||
| .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
- Documentation Overview
- Language Reference
- 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).