exact ⟨Or.inr Y_in, satY⟩
case h
XS YS : List (List Formula)
W : Type
M : KripkeModel W
w : W
nothyp : ¬∃ Y ∈ XS, ∀ f ∈ Y, Evaluate (M, w) f
Y : List Formula
Y_in : Y ∈ YS
satY : ∀ f ∈ Y, Evaluate (M, w) f
⊢ (Y ∈ XS ∨ Y ∈ YS) ∧ ∀ f ∈ Y, Evaluate (M, w) f
no goals