mathlib3

28e79d48 - chore(data/set/basic): add some lemmas to `function.surjective` (#2876)

chore(data/set/basic): add some lemmas to `function.surjective` (#2876) This way they can be used with dot notation. Also rename `set.surjective_preimage` to `function.surjective.injective_preimage`. I think that the old name was misleading.