The category of additive commutative groups is preadditive. #
@[simp]
theorem
AddCommGrp.hom_add_apply
{P Q : AddCommGrp}
(f g : P ⟶ Q)
(x : ↑P)
:
(CategoryTheory.ConcreteCategory.hom (f + g)) x = (CategoryTheory.ConcreteCategory.hom f) x + (CategoryTheory.ConcreteCategory.hom g) x
@[simp]
@[simp]
@[simp]
@[simp]
@[simp]