∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Preadditive C]
  (X : CategoryTheory.SimplicialObject C),
  AlgebraicTopology.DoldKan.homotopyPToId X 0 = Homotopy.refl (AlgebraicTopology.DoldKan.P 0)