simp [Yset, Con] at w_Con
ψ : Formula
W : Type
M : KripkeModel W
w : W
α β : Program
Fs : List Formula
Fδ_in : (Fs, ε) ∈ H α
w_Con : ∀ f ∈ Yset (Fs, ε) (⌈β⌉ψ), evaluate M w f
⊢ ∃ Gγ ∈ H β, evaluate M w (Con (Yset Gγ ψ))
ψ : Formula
W : Type
M : KripkeModel W
w : W
α β : Program
Fs : List Formula
Fδ_in : (Fs, ε) ∈ H α
w_Con : ∀ (f : Formula), f ∈ Fs ∨ f = (~⌈β⌉ψ) → evaluate M w f
⊢ ∃ Gγ ∈ H β, evaluate M w (Con (Yset Gγ ψ))