exact a2_left
case left
α : Type
inst✝ : DecidableEq α
σ_0 σ_1 : Type
M_0 : EpsilonNFA α σ_0
M_1 : EpsilonNFA α σ_1
c : α
p0 q0 : σ_1
xs : List σ_1
a2_left : { start_state := p0, symbol := c, stop_state_list := xs } ∈ M_1.symbol_arrow_list
a2_right : q0 ∈ xs
⊢ { start_state := p0, symbol := c, stop_state_list := xs } ∈ M_1.symbol_arrow_list
no goals