Theorems · Theorem · category theory

CategoryTheory.ConcreteCategory.epi_of_surjective

∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] {FC : C → C → Type u_1} {CC : C → Type w}
  [inst_1 : (X Y : C) → FunLike (FC X Y) (CC X) (CC Y)] [inst_2 : CategoryTheory.ConcreteCategory C FC] {X Y : C}
  (f : X ⟶ Y), Function.Surjective ⇑(CategoryTheory.ConcreteCategory.hom f) → CategoryTheory.Epi f

In any concrete category, surjective morphisms are epimorphisms.

Defined in

Mathlib.CategoryTheory.ConcreteCategory.EpiMono

Cited by

9 results in Mathlib

Foundations

Depth 22 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

CategoryTheory.CategoryFunLikeCategoryTheory.ConcreteCategory