[Merged by Bors] - feat: Unions and intersections indexed by Finset.sigma
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Followup to #8964 From PFR
YaelDillies
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Mathlib/Data/Fintype/Sigma.lean
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| lemma Set.biUnion_finsetSigma_univ (s : Finset ι) (f : Sigma κ → Set α) : | ||
| ⋃ ij ∈ s.sigma fun _ ↦ Finset.univ, f ij = ⋃ i ∈ s, ⋃ j, f ⟨i, j⟩ := by aesop | ||
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| lemma Set.biUnion_finsetSigma_univ' (s : Finset ι) (f : ∀ i, κ i → Set α) : |
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I am not a big fan of the notatiion f : ∀ i, κ i → Set α, but I guess PiNotation is not available here.
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It's available, actually, but I'm afraid using it is a lost cause. I can only find it in comments.
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Followup to #8964 From PFR
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Followup to #8964 From PFR
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Followup to #8964 From PFR
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Followup to #8964
From PFR