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Commit 2022-06-23 23:27 56185bdd

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feat(data/finset): add some lemmas about finset.disj_union (#14910)

Estimated changes

Modified src/algebra/big_operators/basic.lean

added theorem finset.prod_disj_union

Modified src/data/finset/basic.lean

added theorem finset.forall_mem_map

added theorem finset.map_disj_union'

added theorem finset.map_disj_union

added theorem finset.map_disj_union_aux

Modified src/data/finset/fold.lean

added theorem finset.fold_disj_union