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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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Robert J. Simmons b6399e18c3
feat: allow decidable equality for empty lists and empty arrays (#11269) 
This PR adds support for decidable equality of empty lists and empty
arrays. Decidable equality for lists and arrays is suitably modified so
that all diamonds are definitionally equal.

Following #9302, the strong condition of definitionally equal under
`with_reducible_and_instances` is tested. This also moves some of the
comments added in #9302 out of docstrings.

---------

Co-authored-by: Aaron Liu <aaronliu2008@outlook.com>
Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
2025-11-20 20:19:31 +00:00
.claude chore: basic dev instructions for Claude (#11074) 2025-11-04 04:07:53 +00:00
.github chore: CI: bump actions/upload-artifact from 4 to 5 (#11052) 2025-11-11 12:41:14 +00:00
doc fix: symbol clashes between packages (#11082) 2025-11-19 02:24:44 +00:00
images
releases_drafts chore: updates to release_checklist.md (#7817) 2025-04-04 03:45:36 +00:00
script fix: deallocation for closures in non default configurations (#11217) 2025-11-17 16:27:20 +00:00
src feat: allow decidable equality for empty lists and empty arrays (#11269) 2025-11-20 20:19:31 +00:00
stage0 chore: update stage0 2025-11-19 19:40:23 +00:00
tests feat: allow decidable equality for empty lists and empty arrays (#11269) 2025-11-20 20:19:31 +00:00
.gitattributes fix: mark doc parser tests as eol=lf (#10344) 2025-09-11 11:19:01 +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 chore: make USE_LAKE the default (#10016) 2025-08-21 11:43:25 +00:00
CMakePresets.json chore: fix reldebug preset (#8051) 2025-04-23 10:05:11 +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.