∀ {A : Type u_1} [inst : CommRing A] [inst_1 : IsLocalRing A] (f g : PowerSeries A)
  [inst_2 : IsPrecomplete (IsLocalRing.maximalIdeal A) A],
  (f %ʷ g).degree < ↑((PowerSeries.map (IsLocalRing.residue A)) g).order.toNat