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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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Paul Reichert b548cf38b6
feat: enable partial termination proofs about WellFounded.extrinsicFix (#12430) 
This PR provides `WellFounded.partialExtrinsicFix`, which makes it
possible to implement and verify partially terminating functions, safely
building on top of the seemingly less general `extrinsicFix` (which is
now called `totalExtrinsicFix`). A proof of termination is only
necessary in order to formally verify the behavior of
`partialExtrinsicFix`.
2026-02-25 12:43:39 +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: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
images
releases_drafts chore: remove stale release draft notes (#12518) 2026-02-17 19:56:23 +00:00
script fix: update-stage0 under the Lake cache 2026-02-25 11:40:02 +01:00
src feat: enable partial termination proofs about WellFounded.extrinsicFix (#12430) 2026-02-25 12:43:39 +00:00
stage0 chore: update stage0 2026-02-25 11:40:02 +01:00
tests feat: lake shake --only (#12682) 2026-02-25 10:24:50 +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 chore: ignore stage0/ (for rg etc.) 2022-03-18 15:28:20 +01:00
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 doc: triage 2024-07-26 18:24:06 +02:00
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 chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +00:00
lean.code-workspace chore: relative lean-toolchains (#12652) 2026-02-25 10:23:35 +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.