∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Abelian C]
  (S : CategoryTheory.ShortComplex C) {Z : C} (h : S.X₂ ⟶ Z),
  CategoryTheory.CategoryStruct.comp S.abelianImageToKernel
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.kernel.ι S.g) h) =
    CategoryTheory.CategoryStruct.comp (CategoryTheory.Abelian.image.ι S.f) h