exact Y_in
case h.left
W : Type
L R : List Formula
O : Option (NegLoadFormula ⊕ NegLoadFormula)
M : KripkeModel W
w : W
Lcond : List Formula
ress : List (List Formula)
orule : OneSidedLocalRule Lcond ress
osTruth : evaluate M w (Con Lcond) ↔ evaluate M w (discon ress)
preconditionProof : Lcond.Sublist L
w_LRO : (M, w)⊨(L, R, O)
Y : List Formula
Y_in : Y ∈ ress
claim : ∀ f ∈ Y, evaluate M w f
⊢ Y ∈ ress
no goals