∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Preadditive C]
  [inst_2 : CategoryTheory.Limits.HasZeroObject C] (A : C) (n : ℤ),
  ((CochainComplex.singleFunctor C n).obj A).IsStrictlyGE n