leanprover-community / leanprover-community/mathlib4
Sync `DifferentiableAt.inv` and `DifferentiableAt.div`
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Description
The former allows any domain but assumes that the codomain is the base
field. The latter assumes that the domain is the base field but allows
the codomain to be a normed algebra over this field.
Also unify with DifferentiableAt.inv' from leanprover-community/mathlib#19127
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 by locating the definitions and statements for DifferentiableAt.inv and DifferentiableAt.div, then compare them with DifferentiableAt.inv' from leanprover-community/mathlib#19127. Determine the intended common assumptions and unified interface from those declarations. Done means the three results are synchronized without weakening their stated applicability; no test or file path is named.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Refactor
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100