Inconsistent naming for theorems about `++ [a]` on lists
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- Dominant language
- Lean
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Description
Prerequisites
- Check that your issue is not already filed:
https://github.com/leanprover/lean4/issues - Reduce the issue to a minimal, self-contained, reproducible test case.
Avoid dependencies to Mathlib or Batteries. - Test your test case against the latest nightly release, for example on
https://live.lean-lang.org/#project=lean-nightly
(You can also use the settings there to switch to “Lean nightly”)
Description
https://loogle.lean-lang.org/?q=%22append_singleton%22
https://loogle.lean-lang.org/?q=%22concat%22%2C+HAppend.hAppend
We need to make a decision and clean this up.
Expected behavior: Consistent naming.
Actual behavior: Sometimes it's one, sometimes it's the other.
Impact
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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 with the two linked Loogle searches for declarations involving append_singleton and HAppend.hAppend, then inventory the inconsistent theorem names in the Lean source. First establish the naming convention with maintainers; done means the affected declarations follow one consistent convention and the minimal standalone example still works.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Refactor
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100