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)