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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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Siddharth 5f3c0daf3d
feat: BitVec.ushiftRight in terms of extractLsb' (#6745) 
This PR supports rewriting `ushiftRight` in terms of `extractLsb'`. This
is the companion PR to #6743 which adds the similar lemmas about
`shiftLeft`.


```lean
theorem ushiftRight_eq_zero {x : BitVec w} {n : Nat} (hn : w ≤ n) :
    x >>> n = 0#w

theorem ushiftRight_eq_extractLsb'_of_lt {x : BitVec w} {n : Nat} (hn : n < w) :
    x >>> n = ((0#n) ++ (x.extractLsb' n (w - n))).cast (by omega)
```
2025-01-22 19:14:20 +00:00
.github fix: Windows stage0 linking (#6622) 2025-01-14 09:09:50 +01:00
doc doc: mention subscript j in the lexical structure (#6738) 2025-01-22 09:10:31 +00:00
images
nix fix: Windows stage0 linking (#6622) 2025-01-14 09:09:50 +01:00
releases_drafts chore: cherry-pick release notes from releases/v4.15.0 and releases/v4.16.0 (#6520) 2025-01-04 01:25:33 +00:00
script chore: update release checklist (#6637) 2025-01-14 10:18:46 +00:00
src feat: BitVec.ushiftRight in terms of extractLsb' (#6745) 2025-01-22 19:14:20 +00:00
stage0 chore: update stage0 2025-01-20 03:43:04 +00:00
tests feat: improve equation theorem support in grind (#6746) 2025-01-22 18:41:09 +00:00
.gitattributes
.gitignore feat: support Lake for building Lean core oleans (#3886) 2024-06-13 16:18:24 +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: Windows stage0 linking (#6622) 2025-01-14 09:09:50 +01:00
CMakePresets.json chore: modernize build instructions (#4032) 2024-05-23 10:55:07 +00:00
CODEOWNERS chore: adjust CODEOWNERS (#6327) 2024-12-10 08:37:20 +00:00
CONTRIBUTING.md doc: triage 2024-07-26 18:24:06 +02:00
flake.lock feat: ship cadical (#4325) 2024-08-23 09:13:27 +00:00
flake.nix fix: Windows stage0 linking (#6622) 2025-01-14 09:09:50 +01:00
lean-toolchain doc: VS Code dev setup (#2961) 2023-11-30 08:35:03 +00:00
lean.code-workspace chore: add the lean4 extension to the vscode workspace (#3059) 2023-12-14 08:58:21 +00:00
LICENSE
LICENSES feat: ship cadical (#4325) 2024-08-23 09:13:27 +00:00
README.md chore: update documentation title and link README to reference (#6409) 2024-12-17 22:18:56 +00:00
RELEASES.md doc: fix broken code blocks in RELEASES.md (#6527) 2025-01-04 08:08:12 +00:00

README.md

This is the repository for Lean 4.

About

Installation

See Setting Up Lean.

Contributing

Please read our Contribution Guidelines first.

Building from Source

See Building Lean (documentation source: doc/make/index.md).