lean-ja / lean-ja/lean-by-example

「⚪︎⚪︎に…という演算を入れても環にならない」はどう表現するか?

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Lean
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Description

「環になる」は表現できる。
そういうインスタンスが与えられたとして矛盾を導くのか?インスタンス暗黙引数にしちゃうと無理では?

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The issue names no file, test, or entry point. First clarify the intended Lean proposition and whether the goal is a code example or explanatory wording; then locate the relevant section in the repository. Done means the formulation is agreed and documented with a verifiable Lean 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
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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