Theorem Finset.card_le_card_of_surjOn

Modification history

2024-10-17 15:41
Mathlib/Data/Finset/Card.lean
feat: `#s` as notation for `Finset.card s` (#17646) …
Modified Finset.card_le_card_of_surjOnView on Github →
2024-06-12 09:13
Mathlib/Data/Finset/Card.lean
feat: Cardinality of a finset under a surjective map (#13435) …
Added Finset.card_le_card_of_surjOnView on Github →