OpenMath Lean Theorem

Instructions

Set up the Lean proving environment, validate toolchains, and prove downloaded OpenMath theorems locally. Assumes the theorem workspace was already created by the openmath-open-theorem skill.

This skill does not run benchmark providers, prompt-based agent comparisons, or trace persistence workflows. Those belong to the separate openmath-lean-benchmark skill.

Workflow checklist

• [ ] Environment: Verify lean, lake, and elan are installed and match the workspace lean-toolchain.
• [ ] External skills: Install required Lean proof skills from leanprover/skills. Preferred manual install:

```bash

npx leanprover-skills install lean-proof

npx leanprover-skills install mathlib-build

```

If you use preflight auto-install, first review the upstream repo and then pass an explicit target such as --install-dir .codex/skills or --install-dir .claude/skills so the write location is deliberate. Do not run auto-install without an explicit install dir.

• [ ] Preflight: Run python3 scripts/check_theorem_env.py (see references/preflight.md).
• [ ] Prove: Use lean-proof / mathlib-build skills to complete the proof. See references/proof_playbook.md for the OpenMath-specific proving loop.
• [ ] Verify: Confirm lake build -q --log-level=info passes and no sorry remains.
• [ ] Submit: Use the openmath-submit-theorem skill to hash and submit the proof.

Scripts

Notes

• Lean version: Scaffolds pin leanprover/lean4:v4.28.0 and mathlib4 v4.28.0 (set by openmath-open-theorem's download_theorem.py).
• External skills: Not bundled. Required: lean-proof, mathlib-build. Optional: lean-mwe, lean-bisect, nightly-testing, mathlib-review, lean-setup. Manual npx leanprover-skills install ... is preferred; preflight auto-install additionally requires git, explicit user approval, and an explicit install dir.
• Benchmarking: For agent evaluation, prompt comparison, or regression testing on the bundled Lean benchmark corpus, use the separate openmath-lean-benchmark skill.

References

Load when needed (one level from this file):

• references/preflight.md — Lean preflight command, skill checks, and initial build loop.
• references/proof_playbook.md — Step-by-step workflow for proving a downloaded Lean theorem locally.
• references/languages.md — Lean version and standard library.