∀ {R : Type u_1} {C : Type u_2} [inst : Semiring R] [inst_1 : CategoryTheory.Category.{v_1, u_2} C]
  [inst_2 : CategoryTheory.Preadditive C] [inst_3 : CategoryTheory.Linear R C] {S₁ S₂ : CategoryTheory.ShortComplex C}
  (φ : S₁ ⟶ S₂) (a : R) [inst_4 : S₁.HasHomology] [inst_5 : S₂.HasHomology],
  CategoryTheory.ShortComplex.homologyMap (a • φ) = a • CategoryTheory.ShortComplex.homologyMap φ