Re: Simplify[Abs[x],x<0]]

*To*: mathgroup at smc.vnet.net*Subject*: [mg39315] Re: [mg39303] Simplify[Abs[x],x<0]]*From*: Andrzej Kozlowski <akoz at mimuw.edu.pl>*Date*: Tue, 11 Feb 2003 04:41:20 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Almost certainly an oversight. However, if you replace Abs by something equivalent, things work as they should, e.g: Simplify[Sqrt[x*Conjugate[x]], x < 0] -x or Simplify[Sqrt[Im[x]^2 + Re[x]^2], x < 0] -x etc. On Monday, February 10, 2003, at 03:07 PM, Uri Zwick wrote: > Hi, > > Simplify[ Abs[x] , x>0 ] returns x. > But, Simplify[ Abs[x] , x<0] returns Abs[x], and not -x. > > Why is that? > > Uri > > > > Andrzej Kozlowski Yokohama, Japan http://www.mimuw.edu.pl/~akoz/ http://platon.c.u-tokyo.ac.jp/andrzej/