Return-Path: Delivery-Date: Received: from ted.cs.uidaho.edu (no rfc931) by swan.cl.cam.ac.uk with SMTP (PP-6.5) outside ac.uk; Fri, 4 Jun 1993 11:54:34 +0100 Received: by ted.cs.uidaho.edu (16.6/1.34) id AA11290; Fri, 4 Jun 93 03:46:21 -0700 Sender: info-hol-request@ted.cs.uidaho.edu Errors-To: info-hol-request@ted.cs.uidaho.edu Precedence: bulk Received: from swan.cl.cam.ac.uk by ted.cs.uidaho.edu (16.6/1.34) id AA11285; Fri, 4 Jun 93 03:46:09 -0700 Received: from albatross.cl.cam.ac.uk (user sk (rfc931)) by swan.cl.cam.ac.uk with SMTP (PP-6.5) to cl; Fri, 4 Jun 1993 11:45:46 +0100 To: Wishnu Prasetya Cc: info-hol@ted.cs.uidaho.edu (hol mailing list), Sara.Kalvala@cl.cam.ac.uk Subject: Re: REWRITING 2nd argument, how? In-Reply-To: Your message of "Fri, 04 Jun 93 12:05:20 BST." <199306041005.AA11765@infix.cs.ruu.nl> Date: Fri, 04 Jun 93 11:45:41 +0100 From: Sara Kalvala Message-Id: <"swan.cl.cam.:033900:930604104549"@cl.cam.ac.uk> > Can anybody help me to write a tactic that does the following rewriting: > ... > the problem is that trm2 may be a subterm of trm1, so naive rewriting > will also rewrite trm1. Check out the help information for GEN_REWRITE_TAC, which provides a method for selecting a subterm to rewrite: >> GEN_REWRITE_TAC : ((conv -> conv) -> thm list -> thm list -> tactic) >> >> SYNOPSIS >> >> Rewrites a goal, selecting terms according to a user-specified strategy. - Sara