lean-ja / lean-ja/lean-by-example
型クラスの書き換えで嘘(明らかに間違っていそうな命題)を証明する
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メモ
- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
local instance instNatAdd : Add Nat := ⟨Nat.mul⟩
theorem foo : 1 + 0 = 0 := by rfl
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the Lean snippet with the local Add Nat instance and the rfl proof. Read the linked #lean4 discussion about a better Lean checker to determine the intended behavior and scope. Done means the issue has a documented resolution or a clearly scoped fix with a regression test.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100