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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 ff87bcb8e5
feat: add option for simplifying have decls in two passes (#11923) 
This PR adds a new option to the function `simpHaveTelescope` in which
the `have` telescope is simplified in two passes:

* In the first pass, only the values and the body are simplified.
* In the second pass, unused declarations are eliminated.

This new mode eliminates **superlinear** behavior in the benchmark
`simp_3.lean`. Note that the kernel type checker still **exhibits**
quadratic behavior in this example, because it **does not have support**
for expanding a `have`/`let` telescope in a single step.
2026-01-07 01:58:36 +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: write a guideline for tactic docstrings (#11406) 2026-01-06 04:40:20 +00:00
images
releases_drafts chore: add release draft for the module system (#11359) 2025-11-26 15:01:07 +00:00
script chore: include comparator and lean4export in release process (#11899) 2026-01-05 01:08:50 +00:00
src feat: add option for simplifying have decls in two passes (#11923) 2026-01-07 01:58:36 +00:00
stage0 chore: update stage0 2026-01-06 21:42:26 +00:00
tests feat: add option for simplifying have decls in two passes (#11923) 2026-01-07 01:58:36 +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 chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
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 doc: triage 2024-07-26 18:24:06 +02:00
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 doc: VS Code dev setup (#2961) 2023-11-30 08:35:03 +00:00
lean.code-workspace chore: lean.code-workspace: fix terminal cwd (#10802) 2025-10-16 20:19:12 +00:00
LICENSE chore: remove LICENSE header that confused GitHub 2021-11-18 09:42:35 +01:00
LICENSES feat: ship cadical (#4325) 2024-08-23 09:13:27 +00:00
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.