lean-ja / lean-ja/lean-by-example
関手は、空でないならばpure関数を持つ
Open
Nobody has claimed this yet.
- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
これは関手則から言えるはず。
非自明かつ、「関手とは、値を包むコンテナ」という直観とも整合する良い話。
同型な型は同型な型に移すという話もいいけど。
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
No file, entry point, or test is identified in the issue. First inspect the repository's existing functor examples and conventions, then determine where this theorem would belong and what formal statement is intended; done means the non-empty functor claim is added with a checked Lean proof and an explanatory example.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100