∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {S₁ S₂ : CategoryTheory.ShortComplex C} (φ : S₁ ⟶ S₂) (c₁ : CategoryTheory.Limits.CokernelCofork S₁.f)
  (c₂ : CategoryTheory.Limits.CokernelCofork S₂.f) (f : c₁.pt ⟶ c₂.pt),
  CategoryTheory.CategoryStruct.comp φ.τ₂ (CategoryTheory.Limits.Cofork.π c₂) =
      CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.Cofork.π c₁) f →
    CategoryTheory.CategoryStruct.comp (CategoryTheory.Limits.Cofork.π c₁) f =
      CategoryTheory.CategoryStruct.comp φ.τ₂ (CategoryTheory.Limits.Cofork.π c₂)