Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
ba016b2130
Some checks failed
CI / configure (push) Has been cancelled
Update stage0 / update-stage0 (push) Has been cancelled
CI / build (push) Has been cancelled
CI / build-secondary (push) Has been cancelled
CI / Build matrix complete (push) Has been cancelled
CI / release (push) Has been cancelled
CI / release-nightly (push) Has been cancelled
Add FORK_STRATEGY.md documenting: - Purpose: HoTT-compatible kernel extensions (Path types without UIP, transport, HITs) for polytropos's meta-theory. - Why kernel-level: library encodings via Quot leak UIP, incompatible with univalence. Mirrors Cubical Agda's precedent. - Sync strategy: track upstream leanprover/lean4, merge (not rebase), preserve HoTT additions on conflict. - Modification strategy: locality principle (new files under hott/ + src/kernel/hott/ + src/Init/HoTT/); LEAN4-HTT: tag for modifications to upstream files; compile-time feature flag (LEAN_HOTT) gates HoTT. - Patch-series organization for phased primitive additions. - Forbidden moves: no UIP at kernel level, no Quot.sound dependency for HoTT reductions, no Classical.choice in HoTT primitives. Add hott/ directory structure: - hott/README.md describing the fork-specific directory's purpose. - hott/design/ for architectural decisions per phase. - hott/tests/ for HoTT-specific test suites. No kernel modifications in this phase. Subsequent phases: Phase 1: Path + Refl + J primitives Phase 2: transport with computational behavior Phase 3: HIT support Phase 4: cubical primitives if needed Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
||
|---|---|---|
| .claude | ||
| .github | ||
| .vscode | ||
| doc | ||
| hott | ||
| images | ||
| releases_drafts | ||
| script | ||
| src | ||
| stage0 | ||
| tests | ||
| .gitattributes | ||
| .gitignore | ||
| .gitpod.Dockerfile | ||
| .gitpod.yml | ||
| .ignore | ||
| AGENTS.md | ||
| CMakeLists.txt | ||
| CMakePresets.json | ||
| CODEOWNERS | ||
| CONTRIBUTING.md | ||
| flake.lock | ||
| flake.nix | ||
| FORK_STRATEGY.md | ||
| lean-toolchain | ||
| LICENSE | ||
| LICENSES | ||
| README.md | ||
| RELEASES.md | ||
This is the repository for Lean 4.
About
- Quickstart
- Homepage
- Theorem Proving Tutorial
- Functional Programming in Lean
- Documentation Overview
- Language Reference
- Release notes starting at v4.0.0-m3
- Examples
- External Contribution Guidelines
Installation
See Install Lean.
Contributing
Please read our Contribution Guidelines first.
Building from Source
See Building Lean.