simp at ih
Node : Type
inst : DecidableEq Node
g : Graph Node
xs ys : List Node
x✝ x : Node
ih : x ∈ xs ++ ys
⊢ x ∈ reachable_from_list g xs ∨ x ∈ reachable_from_list g ys
Node : Type
inst : DecidableEq Node
g : Graph Node
xs ys : List Node
x✝ x : Node
ih : x ∈ xs ∨ x ∈ ys
⊢ x ∈ reachable_from_list g xs ∨ x ∈ reachable_from_list g ys