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Re: can't MATHEMATICA simplify simple expressions?

• To: mathgroup at smc.vnet.net
• Subject: [mg51541] Re: can't MATHEMATICA simplify simple expressions?
• From: "Jean.Pellegri" <Jean.Pellegri at wanadoo.fr>
• Date: Thu, 21 Oct 2004 22:21:10 -0400 (EDT)
• References: <cl4tg0$8g7$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In[12] := Simplify[(a^2)^(3/2), Element[a, Reals]]


Out[12] = Abs[a]^3



In[10] := Simplify[(a^2)^(3/2), Element[a, Reals] && a >= 0]


Out[10] = a^3



The correct result is a^3 only when a is real and a>=0

jean pellegri



"Cole Turner" <REMOVEcole.tuner at liwest.at> a écrit dans le message de
news:cl4tg0$8g7$1 at smc.vnet.net...
> 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)
>