∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Abelian C]
  (X : CategoryTheory.SimplicialObject C),
  AlgebraicTopology.NormalizedMooreComplex.objD X 0 =
    CategoryTheory.CategoryStruct.comp (AlgebraicTopology.NormalizedMooreComplex.objX X (0 + 1)).arrow
      (CategoryTheory.CategoryStruct.comp (X.δ 0) (CategoryTheory.inv ⊤.arrow))