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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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Kim Morrison 460b3c3e43
fix: grind propagates 0 * a = 0 for CommSemiring (#11881) 
This PR fixes an issue where `grind` failed to prove `f ≠ 0` from `f * r
≠ 0` when using `Lean.Grind.CommSemiring`, but succeeded with
`Lean.Grind.Semiring`.

The `propagateMul` propagator handles `0 * a = 0` and `a * 0 = 0` rules
for semirings that don't have full ring support in grind. Previously,
`CommSemiring` was excluded because it uses a ring envelope for
normalization, but that approach doesn't propagate these equalities back
to the original terms. Now `CommSemiring` also uses `propagateMul`.

Reported as
https://leanprover.zulipchat.com/#narrow/channel/270676-lean4/topic/Grind.20failure.20for.20CommSemiring.2C.20not.20Semiring

🤖 Prepared with Claude Code

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-05 03:14:35 +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 chore: include comparator and lean4export in release process (#11899) 2026-01-05 01:08:50 +00:00
src fix: grind propagates 0 * a = 0 for CommSemiring (#11881) 2026-01-05 03:14:35 +00:00
stage0 chore: update stage0 2025-12-27 03:18:33 +00:00
tests fix: grind propagates 0 * a = 0 for CommSemiring (#11881) 2026-01-05 03:14:35 +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
.gitpod.yml
.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.

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Building from Source

See Building Lean.