simp only [def_and_]
case h1.h1.h1.a.a
P Q : Formula
v : VarName
⊢ IsDeduct {forall_ v P, forall_ v ((P.imp_ Q).and_ (Q.imp_ P))} (((P.imp_ Q).and_ (Q.imp_ P)).imp_ (P.imp_ Q))
case h1.h1.h1.a.a
P Q : Formula
v : VarName
⊢ IsDeduct {forall_ v P, forall_ v ((P.imp_ Q).imp_ (Q.imp_ P).not_).not_}
    (((P.imp_ Q).imp_ (Q.imp_ P).not_).not_.imp_ (P.imp_ Q))