cases a2_right
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 : ℕ
xs : List (ℕ ⊕ σ_0 ⊕ σ_1)
x : σ_0
a2_left : x ∈ M_0.accepting_state_list
a2_right : x = p_0 ∧ List.map (Sum.inr ∘ Sum.inr) M_1.starting_state_list = xs
⊢ Sum.inl q_0 ∉ xs
case intro
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 : ℕ
xs : List (ℕ ⊕ σ_0 ⊕ σ_1)
x : σ_0
a2_left : x ∈ M_0.accepting_state_list
left✝ : x = p_0
right✝ : List.map (Sum.inr ∘ Sum.inr) M_1.starting_state_list = xs
⊢ Sum.inl q_0 ∉ xs