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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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Joe Hendrix ac7b95da86
feat: port Batteries.WF for executable well-founded fixpoints (#11620) 
This PR ports Batteries.WF to Init.WFC for executable well-founded
fixpoints. It introduces `csimp` theorems to replace the recursors and
non-executable definitions with executable definitions.

This ocassionally comes up on Zulip as it prevents admiting definitions
generated from well-founded induction. (e.g., [#lean4 > Computable
WellFounded.fix](https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Computable.20WellFounded.2Efix/with/529347861)
and [#mathlib4 > Why Nat.find is computable, when Wellfounded.fix
isn't?](https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Why.20Nat.2Efind.20is.20computable.2C.20when.20Wellfounded.2Efix.20isn't.3F/with/545143617)).

This was motivated by running into poor elaboration performance with
recursive definitions involving complex inductive types generated by a
custom elaborator. It would be helpful to explore bypassing the
elaborator and generating elaborated terms directly, but this requires
an executable fixpoint (such as `WellFounded.fixC` introduced in
batteries).
2025-12-12 18:22:54 +00:00
.claude chore: update Claude prompting (#11370) 2025-11-26 02:53:36 +00:00
.github chore: ci: bump grove-action to v0.5 (#11559) 2025-12-09 10:33:31 +00:00
doc doc: note that tests/lean/run disables linters (#11595) 2025-12-11 01:33:07 +00:00
images
releases_drafts chore: add release draft for the module system (#11359) 2025-11-26 15:01:07 +00:00
script chore: shake: keep-downstream and import privacy (#11634) 2025-12-12 14:09:50 +00:00
src feat: port Batteries.WF for executable well-founded fixpoints (#11620) 2025-12-12 18:22:54 +00:00
stage0 chore: update stage0 2025-12-12 16:00:39 +00:00
tests feat: port Batteries.WF for executable well-founded fixpoints (#11620) 2025-12-12 18:22:54 +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.