Re: [isabelle] Obtaining the instantiation of variables in a proof
On Wed, Apr 15, 2009 at 10:53 AM, Tobias Nipkow <nipkow at in.tum.de> wrote:
> Stephy Wong wrote:
> > Hi all,
> > Given the trivial proof for EX x. x >' 0' by using the axiom 1' >' 0', is
> > there a way to see by which term x is instantiated (by 1' in this case)?
> > this be done in PG? If not, how can this be done in ML?
> > Thanks
> > Steph
> If your goal is an EX, you can provide the witness by instantiating the
> exI thm before use:
> apply(rule_tac x = "1'" in exI)
> Pls read Section 5.9, Quantifiers, of the Tutorial.
Thanks. What I actually meant is that is it possible to obtain the
instantiation(s) that Isabelle has found automatically? The example I gave
is a trivial one that Isabelle can proof automatically, but I'm interested
in seeing how Isabelle instantiates the theorem. Does this need to be done
in ML? Sorry for the confusion.
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