use a, b
case h.left
W : Type
X : List (List Formula × List Program)
M : KripkeModel W
w : W
φ : Formula
g : List Formula × List Program → Formula → List Formula
a : List Formula
b : List Program
ab_in : (a, b) ∈ X
w_fs : ∀ f ∈ g (a, b) φ, evaluate M w f
⊢ ∃ a_1 b_1, (a_1, b_1) ∈ X ∧ Con (g (a_1, b_1) φ) = Con (g (a, b) φ)
no goals