∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {S₁ S₂ : CategoryTheory.ShortComplex C} (h₁ : S₁.LeftHomologyData) (h₂ : S₂.LeftHomologyData),
  (CategoryTheory.ShortComplex.LeftHomologyMapData.zero h₁ h₂).φH = 0