exact h2
case h2
D : Type
I : Interpretation D
head✝ : Definition
tail✝ : List Definition
tail_ih✝ :
  ∀ (V V' : VarAssignment D) (F F' : Formula) (binders : List (VarName × VarName)),
    AlphaEqvVarAssignment D binders V V' → isAlphaEqvAux binders F F' → (Holds D I V tail✝ F ↔ Holds D I V' tail✝ F')
x : VarName
phi : Formula
phi_ih :
  ∀ (V V' : VarAssignment D) (F' : Formula) (binders : List (VarName × VarName)),
    AlphaEqvVarAssignment D binders V V' →
      isAlphaEqvAux binders phi F' → (Holds D I V (head✝ :: tail✝) phi ↔ Holds D I V' (head✝ :: tail✝) F')
V V' : VarAssignment D
binders : List (VarName × VarName)
y : VarName
phi' : Formula
d : D
h1_V : VarAssignment D
h2 : isAlphaEqvAux [(x, y)] phi phi'
⊢ isAlphaEqvAux [(x, y)] phi phi'
no goals