exact fun his ↦ Eq.symm <| by simpa using mt (support_subset_iff.1 hx i) his
case h
α : Type u_1
R✝¹ : Type u_2
η : Type u_3
ι : Type u_4
R✝ : Type u_5
inst✝¹ : Semiring R✝
s✝ : Set α
R : Type u_6
inst✝ : Semiring R
s : Set η
x : η → R
hx : support x ⊆ s
i : η
⊢ i ∉ s → 0 = x i
no goals