I have two assumptions both in implicative forms with universal
quantification. I would like to obtain an MP in the spirit of the following
theorem:

val GEN_IMP_TRANS = store_thm("GEN_IMP_TRANS",
    ``!P Q R S. (!x. P x ==> Q (R x)) ==> (!x. Q x ==> S x) ==> (!x. P x
==> S (R x))``,
    metis_tac []);

However if I use drule with the theorem the antecedent of the resolution is
put into a conjunction (the last forall is moved left and the antecedent
becomes (!x. Q x ==> S x) /\ P x') and can not be used to resolve against
the second assumption. Any suggestions?

Thanks,
Haitao
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