case axiom_ h1_phi h1_1 =>
  apply IsDeduct.axiom_
  apply IsAxiom.gen_
  exact h1_1
F : Formula
v : VarName
Δ : Set Formula
h2 : ∀ H ∈ Δ, ¬isFreeIn v H
h1_phi : Formula
h1_1 : IsAxiom h1_phi
⊢ IsDeduct Δ (forall_ v h1_phi)
no goals