∀ {C : Type u_1} [inst : CategoryTheory.Category.{v, u_1} C] [inst_1 : CategoryTheory.Preadditive C]
  (S : CategoryTheory.ShortComplex (CochainComplex C ℤ))
  (σ : (n : ℤ) → (S.map (HomologicalComplex.eval C (ComplexShape.up ℤ) n)).Splitting)
  [inst_2 : CategoryTheory.Limits.HasBinaryBiproducts C] (p q : ℤ) (hpq : p + 1 = q),
  CochainComplex.mappingConeHomOfDegreewiseSplitXIso S σ p q hpq =
    CochainComplex.mappingConeHomOfDegreewiseSplitXIso S σ p q hpq