cases x <;> simp
case e_a.e_ω.e_e.h
L✝ : Language
ξ✝ : Type u_1
n n₁ n₂✝ n₂ m m₁ m₂ m₃ : ℕ
L : Language
L₁ : Language
L₂ : Language
L₃ : Language
ξ : Type u_2
Φ : L₁ →ᵥ L₂
p : SyntacticSemiformula L₁ n
x : ℕ
⊢ Semiterm.lMap Φ ((#(Fin.last n) :>ₙ Semiterm.fvar) x) = (#(Fin.last n) :>ₙ Semiterm.fvar) x
no goals