induction p using Semiformula.rec' <;> try simp [Rew.rel, Rew.nrel, *]
L : Language
ξ : Type u_1
ξ₁ : Type u_2
ξ₂ : Type u_3
n : ?m.1833779
n₁ n₂ : ℕ
ω : Rew L ξ₁ n₁ ξ₂ n₂
p : Semiformula L ξ₁ n₁
⊢ (ω.hom p).Open ↔ p.Open
no goals