∀ {Γ : Type u_1} {R : Type u_3} [inst : AddCommMonoid Γ] [inst_1 : PartialOrder Γ] [inst_2 : IsOrderedCancelAddMonoid Γ]
  [inst_3 : Semiring R] (x : HahnSeries Γ R) (n : ℕ), (x ^ n).support ⊆ ↑(AddSubmonoid.closure x.support)