*To*: Stephy Wong <s.wong.731 at googlemail.com>*Subject*: Re: [isabelle] Obtaining the instantiation of variables in a proof*From*: Tobias Nipkow <nipkow at in.tum.de>*Date*: Wed, 15 Apr 2009 10:53:19 +0200*Cc*: isabelle-users at cl.cam.ac.uk*In-reply-to*: <12d162d00904140905i4e891cd0gd1c9e86eab0a98e0@mail.gmail.com>*References*: <12d162d00904140905i4e891cd0gd1c9e86eab0a98e0@mail.gmail.com>*User-agent*: Thunderbird 2.0.0.19 (X11/20081227)

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)? Can > 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. Tobias

**Follow-Ups**:**Re: [isabelle] Obtaining the instantiation of variables in a proof***From:*Stephy Wong

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