Re: simple Simplify[] question
- To: mathgroup at smc.vnet.net
- Subject: [mg19790] Re: simple Simplify[] question
- From: Adam Strzebonski <adams at wolfram.com>
- Date: Fri, 17 Sep 1999 01:36:45 -0400
- Organization: Wolfram Research, Inc.
- References: <7rnkqn$emf@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
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)
There are values of a for which
(a^2)^(3/2) is not equal to a^3.
In[5]:= {(a^2)^(3/2), a^3} /. a->-1
Out[5]= {1, -1}
In V4 you can give assumptions to Simplify, and if
you assume that a>=0 you get the simplification.
In[6]:= Simplify[(a^2)^(3/2), a>=0]
3
Out[6]= a
Best Regards,
Adam Strzebonski
Wolfram Research