∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {S₁ S₂ : CategoryTheory.ShortComplex C} (h₁ : S₁.LeftHomologyData) (h₂ : S₂.LeftHomologyData),
  CategoryTheory.CategoryStruct.comp 0 h₂.i =
    CategoryTheory.CategoryStruct.comp h₁.i (CategoryTheory.ShortComplex.Hom.τ₂ 0)