Commit 2021-12-31 14:15 b142b697
View on Github →feat(data/list/count): add lemma count_le_count_map
(#11148)
Generalises count_map_map
: for any f : α → β
(not necessarily injective), count x l ≤ count (f x) (map f l)
feat(data/list/count): add lemma count_le_count_map
(#11148)
Generalises count_map_map
: for any f : α → β
(not necessarily injective), count x l ≤ count (f x) (map f l)