leanprover-community / leanprover-community/mathlib4
Generalize `MeasureTheory.tendsto_measure_iUnion`
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Description
It should be possible to prove it assuming that atTop is countably generated.
Then it will work for real numbers etc.
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 MeasureTheory.tendsto_measure_iUnion theorem and inspect how its current assumptions are used. Generalize the result so it assumes that atTop is countably generated, and verify that the theorem also applies to real numbers.
Written by the indexing model from the issue text.
Assessment
- Domain
- devtools
- Issue type
- Refactor
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100