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Theorem finset.card_le_one_iff_subset_singleton

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_iff_subset_singletonView 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)
Added finset.card_le_one_iff_subset_singletonView on Github →