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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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Henrik Böving d20b6ece58
refactor: port toposort from IR to LCNF (#12644) 
This PR ports the toposorting pass from IR to LCNF.

We can already do this now as the remaining IR pipeline does not insert
any new auxiliary
declarations into the SCC so now is as good a time as ever to do it.
2026-02-23 10:09:32 +00:00
.claude chore: CLAUDE.md: restrict build parallelism (#12624) 2026-02-22 14:35:05 +00:00
.github feat: lazy initialization of closed terms (#12044) 2026-02-20 08:45:15 +00:00
doc chore: improve release command PR status checking (#12536) 2026-02-17 21:21:30 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: update bump branch toolchain to nightly for all repos (#12586) 2026-02-19 13:04:26 +00:00
src refactor: port toposort from IR to LCNF (#12644) 2026-02-23 10:09:32 +00:00
stage0 chore: update stage0 2026-02-23 04:20:25 +00:00
tests fix: mark failed compilations as noncomputable (#12625) 2026-02-23 09:18:21 +00:00
.gitattributes doc: grove: update and add String data (#11551) 2025-12-08 16:49:37 +00:00
.gitignore chore: enable leanprover/skills plugin for Claude Code (#12609) 2026-02-20 12:35:32 +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 chore: fix repeated cmake calls breaking the build (#12598) 2026-02-19 16:23:47 +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: update to c++20 (#12117) 2026-02-11 01:17:40 +00:00
flake.nix chore: update to c++20 (#12117) 2026-02-11 01:17:40 +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.