case _ c1 =>
  rfl
Δ : List Formula
F : Formula
v : VarName
phi : Formula
ih : ¬isFreeIn v phi
D : Type
I : Interpretation D
V : VarAssignment D
E : Env
a✝ : ∀ H ∈ [], Holds D I V E H
a2 : Holds D I V E phi
d : D
v' : VarName
a1 : isFreeIn v' phi
c1 : ¬v' = v
⊢ V v' = V v'
no goals