exact ofSubformula_toSubformula p (by simp only [bv_all] at h; exact Nat.le_add_of_sub_le h)
L : Language
μ : Type v
x✝ : ℕ
p : UFormula L μ
h : p.all.bv ≤ x✝
⊢ ↑(ofSubformula (p.toSubformula ⋯)) = p
no goals