Theorem Finset.card_union_eq

Modification history

2024-02-11 21:58
Mathlib/Data/Finset/Card.lean
feat: `(s ∩ t).card = s.card + t.card - (s ∪ t).card` (#10224) …
Deleted Finset.card_union_eqView on Github →
2023-01-16 16:20
Mathlib/Data/Finset/Card.lean
feat: port Data.Finset.Card (#1589)
Added Finset.card_union_eqView on Github →