∀ {C : Type u} [inst : CategoryTheory.Category.{v, u} C] [inst_1 : CategoryTheory.Abelian C]
  [inst_2 : CategoryTheory.EnoughProjectives C] (Z : C) (n : ℕ),
  CategoryTheory.Projective ((CategoryTheory.ProjectiveResolution.ofComplex Z).X n)