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Commit 2021-12-31 14:15 a5573f37

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feat(data/{fin,multi}set/powerset): add some lemmas about powerset_len (#10866) For both multisets and finsets From flt-regular

Estimated changes

Modified src/data/finset/powerset.lean

added theorem finset.map_val_val_powerset_len

added theorem finset.powerset_len_card_add

Modified src/data/multiset/powerset.lean

added theorem multiset.powerset_len_card_add

added theorem multiset.powerset_len_empty

added theorem multiset.powerset_len_map

modified theorem multiset.powerset_len_zero_right