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MathGroup Archive 2001

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Re: Simplify

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32016] Re: [mg32007] Simplify
  • From: Andrzej Kozlowski <andrzej at tuins.ac.jp>
  • Date: Wed, 19 Dec 2001 04:28:49 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Because it is not true. For example:
In[1]:=
Simplify[{(a^b)^(1/b),a}/.{a->-1,b->2}]

  Out[1]=
{1,-1}

However,

  In[2]:=

Simplify[(a^b)^(1/b),{a>=0,Element[b,Reals]}]

Out[2]=
a


Andrzej Kozlowski
Toyama International University
JAPAN
http://platon.c.u-tokyo.ac.jp/andrzej/


On Tuesday, December 18, 2001, at 04:34  PM, Matthias.Bode at oppenheim.de 
wrote:

> Dear Colleagues,
>
> why should I not expect MATHEMATICA to (Full)Simplify
>
> (a^b)^(1/b) or a^b^(1/b) to a?
>
> Best regards,
>
> Matthias Bode
> Sal. Oppenheim jr. & Cie. KGaA
> Koenigsberger Strasse 29
> D-60487 Frankfurt am Main
> GERMANY
> Tel.: +49(0)69 71 34 53 80
> Mobile: +49(0)172 6 74 95 77
> Fax: +49(0)69 71 34 95 380
> E-mail: matthias.bode at oppenheim.de
> Internet: http://www.oppenheim.de
>
>
>
>
>



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