unfold exists_
E : Env
Γ : List (VarName × MetaVarName)
Δ : List Formula
F : Formula
h1_Γ : List (VarName × MetaVarName)
h1_Δ : List Formula
h1_x h1_y : VarName
h1_1 : ¬h1_y = h1_x
⊢ IsMetaVarOrAllDefInEnv E (exists_ h1_x (eq_ h1_x h1_y))
E : Env
Γ : List (VarName × MetaVarName)
Δ : List Formula
F : Formula
h1_Γ : List (VarName × MetaVarName)
h1_Δ : List Formula
h1_x h1_y : VarName
h1_1 : ¬h1_y = h1_x
⊢ IsMetaVarOrAllDefInEnv E (forall_ h1_x (eq_ h1_x h1_y).not_).not_