lean-ja / lean-ja/lean-by-example
A → Option B という関数型と、HashMap A B の違いを説明する
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- Dominant language
- Lean
- Stars
- 188
- Forks
- 15
- Avg merge
- 9h 8m
- Merged PRs (30d)
- 6
Description
数学的には等価なのだが、計算的には異なる。
数学だったら問題にならないので、「プログラミング言語でもある」Lean らしさのある疑問といえる。これに答えることは、Lean らしさとは何かという疑問の答えに近づくことになる。
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
Start from the question in the issue and investigate how Lean treats A → B compared with HashMap A B, separating their mathematical equivalence from their computational behavior. Done means adding a clear explanation of the distinction and why it reflects Lean's programming-language character; no file or test is identified in the payload.
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
- 48/100