Theorem Finset.card_le_one_iff_subsingleton_coe

Modification history

2023-09-13 21:26
Mathlib/Data/Finset/Card.lean
feat: add `Finset.card_le_one_iff_subsingleton` and `Finset.one_lt_card_iff_nontrivial` (#7131) …
Added Finset.card_le_one_iff_subsingleton_coeView on Github →