lean-ja / lean-ja/lean-by-example
`*.rec` が何者なのかを説明する
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- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
謎の自動生成定数なのでちゃんと説明したい。
帰納法のときに使うものなのだが、カリーハワード同型対応により「帰納法は再帰」なので、再帰のときにも使う。
なぜLeanのカーネルは再帰関数を *.rec に変換して持つのだろうか？という疑問に答えたい。
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
Search the repository for existing explanations or examples of *.rec and read the surrounding documentation first. Explain what these generated constants represent, their role in induction and recursion, and why the Lean kernel stores recursive functions in this form; done means the question is answered clearly for readers.
Written by the indexing model from the issue text.
Assessment
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100