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Theorem set.union_eq_union_iff_subset_subset

Modification history

2022-07-17 23:41
src/data/set/basic.lean
feat(order/lattice): Congruence lemmas for `⊔` and `⊓` (#15439) …
Deleted set.union_eq_union_iff_subset_subsetView on Github →
2022-07-01 18:31
src/data/set/basic.lean
feat(order/lattice, data/set): some helper lemmas (#14789) …
Added set.union_eq_union_iff_subset_subsetView on Github →