∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {S₁ S₂ : CategoryTheory.ShortComplex C} (self : S₁.Hom S₂),
  CategoryTheory.CategoryStruct.comp self.τ₂ S₂.g = CategoryTheory.CategoryStruct.comp S₁.g self.τ₃