Mathlib Changelog
v4
Changelog
About
Github
Theorem
Finset.card_union
Modification history
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_union
View on Github →