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Re : can't MATHEMATICA simplify simple expressions?

• To: mathgroup at smc.vnet.net
• Subject: [mg51513] Re : [mg51505] can't MATHEMATICA simplify simple expressions?
• From: "Florian Jaccard" <florian.jaccard at eiaj.ch>
• Date: Thu, 21 Oct 2004 22:20:15 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello !

You expect an answer wich is correct only if a real and a>0 !

In[3]:=
Simplify [ (a^2)^(3/2),a>0 ]

Out[3]=
a^3

But if a is, let us say, -I, you expect a wrong answer :

In[7]:=
((-I)^2)^(3/2) == (-I)^3

Out[7]=
False

Regards
 
F.Jaccard


-----Message d'origine-----
De : Cole Turner [mailto:REMOVEcole.tuner at liwest.at] 
Envoyé : mercredi, 20. octobre 2004 07:22
À : mathgroup at smc.vnet.net
Objet : [mg51505] can't MATHEMATICA simplify simple expressions?

if I enter:

FullSimplify [ (a^2)^(3/2) ]

(in correct MATHEMATICA syntax, the program does not yield the correct
result, a^3 ... 

why is that?

thanks!
-- 
Johnny: [plugging back in the runway lights] 
          "Just kidding."
                   ('Airplane!', 1980)