∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Abelian C] {A B : Cᵒᵖ}
  (g : A ⟶ B),
  (CategoryTheory.Limits.kernel.ι g.unop).op =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.eqToHom ⋯)
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.cokernel.π g) (CategoryTheory.kernelUnopOp g).inv)