leanprover-community / leanprover-community/mathlib4
Redefine `Matrix.UnitaryGroup.toGL` etc
Open
Nobody has claimed this yet.
enhancement
- Dominant language
- Lean
- Stars
- 4.1k
- Forks
- 1.7k
- PR merge metrics
- No merged PRs in 30d
Description
We can golf this and related definitions a lot as explained in a porting note in the file. We shouldn't do this until after the port to avoid backporting it to Mathlib 3.
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 file containing Matrix.UnitaryGroup.toGL and the related definitions, then read the porting note there. Verify that the port is complete before assessing the proposed golfing work; done means the related definitions have been compacted without requiring backporting to Mathlib 3.
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
- Needs clarification
- Newbie friendliness
- 30/100