SC
case a
P : Formula
v t : VarName
h1 : fastAdmitsAux v t ∅ P
⊢ IsDeduct ∅
    (((forall_ v P.not_).imp_ (fastReplaceFree v t P).not_).imp_ ((fastReplaceFree v t P).imp_ (forall_ v P.not_).not_))
no goals