[Merged by Bors] - feat: filter_disjiUnion#28443
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mitchell-horner wants to merge 3 commits intoleanprover-community:masterfrom
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[Merged by Bors] - feat: filter_disjiUnion#28443mitchell-horner wants to merge 3 commits intoleanprover-community:masterfrom
filter_disjiUnion#28443mitchell-horner wants to merge 3 commits intoleanprover-community:masterfrom
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PR summary 28844c3b8cImport changes for modified filesNo significant changes to the import graph Import changes for all files
Declarations diff
You can run this locally as follows## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>
## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>The doc-module for No changes to technical debt.You can run this locally as
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plp127
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Aug 15, 2025
Mathlib/Data/Finset/Union.lean
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| (s.disjiUnion t h).fold op (s.fold op b₀ b) f = s.fold op b₀ fun i => (t i).fold op (b i) f := | ||
| (congr_arg _ <| Multiset.map_bind _ _ _).trans (Multiset.fold_bind _ _ _ _ _) | ||
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| private lemma pairwiseDisjoint_filter {f : α → Finset β} (h : (↑s : Set α).PairwiseDisjoint f) |
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It doesn't have to be. I just saw this lemma above
private lemma pairwiseDisjoint_fibers : Set.PairwiseDisjoint ↑t fun a ↦ s.filter (f · = a) := ...
that serves a similar purpose is private.
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Needed for a proof of the Erdős-Stone-Simonovits theorem in future PR.