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Re: higher order sub-term rewriting
> Is it possible to rewrite the goal using the hypothesis. Note that
> such a rewrite is possible within the HOL system, thanks to higher
> order rewriting.
(rewrite -1) is the usual way to rewrite with an antecedent formula.
PVS does some subclass of higher-order matching. If it doesn't get
this example, send the full thing (M-x dump-pvs-files) and Shankar may
be able to offer an explanation or help.