case _ p_0 =>
  cases p_0
  case _ p_0 =>
    simp
  case _ p_0 =>
    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 ⊕ σ_1
⊢ (Sum.inr p_0 ∈ List.map Sum.inr (List.map Sum.inl M_0.starting_state_list)) =
    match Sum.inr p_0 with
    | Sum.inr (Sum.inl p') => p' ∈ M_0.starting_state_list
    | x => False
no goals