case conv_refl h2_phi =>
  rfl
D : Type
I : Interpretation D
M : MetaValuation D
E : Env
F F' : Formula
h1 : E.WellFormed
h2_phi : Formula
V : Valuation D
⊢ Holds D I V M E h2_phi ↔ Holds D I V M E h2_phi
no goals