∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Preadditive C]
  (K : CochainComplex C ℤ) (n i j : ℤ),
  ((CategoryTheory.shiftFunctor (CochainComplex C ℤ) n).obj K).d i j =
    n.negOnePow • K.d (i + { as := n }.as) (j + { as := n }.as)