rintro rfl
L : Language
ξ : Type u_1
n n₁ n₂✝ n₂ m m₁ m₂ m₃ : ℕ
p q : Semiformula L ξ n
h : p.complexity ≠ q.complexity
⊢ p ≠ q
L : Language
ξ : Type u_1
n n₁ n₂✝ n₂ m m₁ m₂ m₃ : ℕ
p : Semiformula L ξ n
h : p.complexity ≠ p.complexity
⊢ False