Goal:
    p : positive  IHp : Z.pos p = Z.pos p  cstr : (0 < Z.pos p)%Z
  ============================
   ((Z.pos p + 1)%Z = (Z.pos p + 1)%Z)


DEBUG:Going to execute:
lazymatch Zify.zify_convert_to_euclidean_division_equations_flag
           with
           | true =>
               Zify.zify_internal_to_euclidean_division_equations
           | false => idtac
           end