intro X _
case h2
D : Type
I : Interpretation D
V : VarAssignment D
E : Env
τ : PredName → ℕ → List VarName × Formula
F : Formula
h1 : admits τ F
⊢ ∀ x ∉ ∅, V x = V x
case h2
D : Type
I : Interpretation D
V : VarAssignment D
E : Env
τ : PredName → ℕ → List VarName × Formula
F : Formula
h1 : admits τ F
X : VarName
a✝ : X ∉ ∅
⊢ V X = V X