exact ⟨s(⟨a, edge_vert _ he⟩, ⟨b, edge_vert _ he.symm⟩), Sym2.map_pair_eq _ _ _⟩
case h
α : Type u_1
β : Type u_2
γ : Type u_3
V : Type u_4
G H : SimpleGraph V
G' : G.Subgraph
a b : V
he : G'.Adj a b
⊢ s(a, b) ∈ Set.range (Sym2.map Subtype.val)
no goals