Re: simple Simplify[] question

*To*: mathgroup at smc.vnet.net*Subject*: [mg19784] Re: simple Simplify[] question*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Fri, 17 Sep 1999 01:36:41 -0400*Organization*: Universitaet Leipzig*References*: <7rnkqn$emf@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, a) Why, look at the two plots : Plot3D[Re[((x + I*y)^2)^(3/2)], {x, -1, 1}, {y, -1, 1}] Plot3D[Re[(x + I*y)^3], {x, -1, 1}, {y, -1, 1}] than you see why. b) PowerExpand[] will give a^3 as well as Simplify[(a^2)^(3/2), Element[a, Reals] && a > 0 ] Hope that helps Jens Ulf Saalmann wrote: > > Hello, > > why gives Mathematica > 2 3/2 > Simplify[(a^2)^(3/2)] (a ) > > and not > 3 > a > > and how to convince Mathematica to do it? > > Thanks > Ulf (us at atom.msi.se)