Theorem Finset.card_union

Modification history

2024-10-17 15:41
Mathlib/Data/Finset/Card.lean
feat: `#s` as notation for `Finset.card s` (#17646) …
Modified Finset.card_unionView on Github →
2024-02-11 21:58
Mathlib/Data/Finset/Card.lean
feat: `(s ∩ t).card = s.card + t.card - (s ∪ t).card` (#10224) …
Added Finset.card_unionView on Github →