simp
case h1
P Q : Formula
v : VarName
h1 : ¬isFreeIn v Q
⊢ IsDeduct (∅ ∪ {forall_ v (P.imp_ Q)}) ((exists_ v P).imp_ Q)
case h1
P Q : Formula
v : VarName
h1 : ¬isFreeIn v Q
⊢ IsDeduct {forall_ v (P.imp_ Q)} ((exists_ v P).imp_ Q)