∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Abelian C]
  (X : CategoryTheory.SimplicialObject C) (n : ℕ),
  ((AlgebraicTopology.normalizedMooreComplex C).obj X).d (n + 1) n = AlgebraicTopology.NormalizedMooreComplex.objD X n