∀ {σ : Type u_1} (w : σ → ℕ) {R : Type u_3} [inst : Ring R] (p : MvPowerSeries σ R) (T : Subring R)
  (hp : ∀ (n : σ →₀ ℕ), (MvPowerSeries.coeff n) p ∈ T),
  MvPowerSeries.weightedOrder w (p.toSubring T hp) = MvPowerSeries.weightedOrder w p