Simplify and Abs

*To*: mathgroup at smc.vnet.net*Subject*: [mg54602] Simplify and Abs*From*: Simon Anders <simon.anders at uibk.ac.at>*Date*: Thu, 24 Feb 2005 03:21:06 -0500 (EST)*Organization*: University of Innsbruck, Austria*Sender*: owner-wri-mathgroup at wolfram.com

Hi, can it really be that this is already beyond Mathematica? In := FullSimplify[Abs[p - 1], p < 1 && p > 1/2] Out := Abs[-1 + p] How do I make Matheamtica notice, that the assumptions constrain the argument of Abs[] to positive values? Any suggestions how to treat these kinds of problems? Specifically, I have a list of products of absolute values of simple polynomials in p and I know that p is in the interval [0,1]. I would like to know whether the polynomials have constant sign over the interval so that the Abs[] can be removed. Can this be done automatically? TIA Simon

**Follow-Ups**:**Re: Simplify and Abs***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: Simplify and Abs***From:*DrBob <drbob@bigfoot.com>