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Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
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Leonardo de Moura f1c903ca65
feat: simplify lambdas in Sym.simp (#11898) 
This PR adds support for simplifying lambda expressions in `Sym.simp`.
It is much more efficient than standard simp for very large lambda
expressions with many binders. The key idea is to generate a custom
function extensionality theorem for the type of the lambda being
simplified.

This technique is compatible with the standard `simp` tactic, and will
be ported in a separate PR.

<img width="581" height="455" alt="image"
src="https://github.com/user-attachments/assets/5911dc6c-03f0-48ed-843b-b8cb4f67ee61"
/>

### `lambda` benchmark summary

| Lambda size | MetaM (ms) | SymM (ms) | Speedup |
|-------------|------------|-----------|---------|
| 50          | 22.7       | 0.74      | ~31×    |
| 100         | 120.5      | 1.75      | ~69×    |
| 150         | 359.6      | 2.90      | ~124×   |
| 200         | 809.5      | 4.51      | ~180×   |
2026-01-05 01:00:30 +00:00
.claude doc: expand PR creation guidelines in CLAUDE.md (#11835) 2025-12-29 17:42:28 +00:00
.github fix: remove batteries tag check from PR mathlib CI (#11707) 2025-12-17 08:53:04 +00:00
doc doc: replace ffi.md with links to the reference manual (#11737) 2025-12-19 07:23:06 +00:00
images
releases_drafts chore: add release draft for the module system (#11359) 2025-11-26 15:01:07 +00:00
script feat: add lean-bisect script for bisecting toolchain regressions (#11727) 2025-12-21 20:04:47 +00:00
src feat: simplify lambdas in Sym.simp (#11898) 2026-01-05 01:00:30 +00:00
stage0 chore: update stage0 2025-12-27 03:18:33 +00:00
tests feat: simplify lambdas in Sym.simp (#11898) 2026-01-05 01:00:30 +00:00
.gitattributes doc: grove: update and add String data (#11551) 2025-12-08 16:49:37 +00:00
.gitignore chore: add .vscode/settings.json to .gitignore (#10795) 2025-10-16 07:08:41 +00:00
.gitpod.Dockerfile chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.gitpod.yml chore: add gitpod configuration (#6382) 2024-12-15 21:38:13 +00:00
.ignore
CMakeLists.txt fix: cadical dynamic dependencies (#11475) 2025-12-02 13:54:26 +00:00
CMakePresets.json chore: CI: enable leak sanitizer again (#11339) 2025-11-27 18:32:35 +00:00
CODEOWNERS chore: make @hargoniX code owner of the compiler (#10732) 2025-10-10 04:43:38 +00:00
CONTRIBUTING.md
flake.lock chore: robustify Nix shell (#8141) 2025-04-28 15:08:32 +00:00
flake.nix chore: use lld if available for building core (#10694) 2025-10-08 16:47:30 +00:00
lean-toolchain
lean.code-workspace chore: lean.code-workspace: fix terminal cwd (#10802) 2025-10-16 20:19:12 +00:00
LICENSE
LICENSES
README.md doc: update URLs that are currently pointing to redirects (#10397) 2025-09-17 15:50:07 +00:00
RELEASES.md chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00

README.md

This is the repository for Lean 4.

About

Installation

See Install Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean.