Mathlib v3 is deprecated. Go to Mathlib v4

Theorem finset.card_le_one_of_subsingleton

Modification history

2021-12-18 18:09
src/data/finset/basic.lean
split(data/finset/*): Split `data.finset.card` and `data.finset.fin` off `data.finset.basic` (#10796) …
Modified finset.card_le_one_of_subsingletonView on Github →
2021-05-03 07:41
src/data/finset/basic.lean
feat(data/finset/basic): a finset has card at most one iff it is contained in a singleton (#7404)
Modified finset.card_le_one_of_subsingletonView on Github →
2020-06-22 16:12
src/data/fintype/basic.lean
feat(data/finset,data/fintype,algebra/big_operators): some more lemmas (#3124) …
Added finset.card_le_one_of_subsingletonView on Github →