case h
Γ : Type u_1
R : Type u_2
inst✝¹ : PartialOrder Γ
inst✝ : AddGroup R
x : HahnSeries Γ R
x✝ : Γ
⊢ x✝ ∈ support (-x) ↔ x✝ ∈ support x
Γ : Type u_1
R : Type u_2
inst✝¹ : PartialOrder Γ
inst✝ : AddGroup R
x : HahnSeries Γ R
⊢ support (-x) = support x
ext
no goals
case h
Γ : Type u_1
R : Type u_2
inst✝¹ : PartialOrder Γ
inst✝ : AddGroup R
x : HahnSeries Γ R
x✝ : Γ
⊢ x✝ ∈ support (-x) ↔ x✝ ∈ support x
simp