∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Abelian C]
  (S : CategoryTheory.ShortComplex C),
  CategoryTheory.CategoryStruct.comp
      (CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.kernel.ι S.g) (CategoryTheory.Limits.cokernel.π S.f))
      S.cokernelToAbelianCoimage =
    0