exact Hierarchy.of_zero (HSemiformula.sigma_prop _)
case delta.mkDelta
L : Language
inst✝ : L.ORing
ξ✝ : Type v
n : ℕ
ξ : Type u_1
Γ : SigmaPiDelta
m✝ : ℕ
Γ' : Polarity
m : ℕ
a✝¹ : HSemiformula L ξ n (𝚺, 0)
a✝ : HSemiformula L ξ n (𝚷, 0)
⊢ Hierarchy Γ' m a✝¹.val
no goals