∀ {C : Type u_2} [inst : CategoryTheory.Category.{u_1, u_2} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  [inst_2 : CategoryTheory.Limits.HasZeroObject C] (X : C) (n : ℕ),
  CategoryTheory.CategoryStruct.comp (HomologicalComplex.sc (ChainComplex.alternatingConst.obj X) n).f 0 = 0