simp
α : Type
inst✝ : DecidableEq α
σ_0 σ_1 : Type
M_0 : EpsilonNFA α σ_0
M_1 : EpsilonNFA α σ_1
p_0 : σ_0
q_0 : σ_1
xs : List (σ_0 ⊕ σ_1)
x : EpsilonArrow σ_0
a✝¹ : x ∈ M_0.epsilon_arrow_list
a✝ : x.start_state = p_0
a3 : List.map Sum.inl x.stop_state_list = xs
⊢ Sum.inr q_0 ∉ List.map Sum.inl x.stop_state_list
no goals