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Re: simple Simplify[] question

• To: mathgroup at smc.vnet.net
• Subject: [mg19867] Re: simple Simplify[] question
• From: adam.smith at hillsdale.edu
• Date: Sun, 19 Sep 1999 01:20:49 -0400
• Organization: Deja.com - Share what you know. Learn what you don't.
• References: <7rnkqn$emf@smc.vnet.net> <7rskd8$qan$2@dragonfly.wolfram.com>
• Sender: owner-wri-mathgroup at wolfram.com

Many similar questions concerning declaring variables to be positive or
real, etc. have come up.  As far as I have been able to tell there is
no good way to do it in 3.0.  This seems to me the biggest useful
improvement made in 4.0.  If someone does provide a solution in 3.0
please email it to me (adam.smith at hillsdale.edu).

I am personally a little upset that they want $375 to upgrade to 4.0,
which seems to me in many ways a fix of some of the deficiencies found
in Ver 3.  I mean I only had 3.0 for about 8 months before 4.0 came
out.  I realize that product cycles for software are decreasing.
However, I am a little hesitant to pay that kind of money for 4.0 when
instead of fixing the problems in 4.0, Wolfram might replace with 5.0
it and force me to pay a considerable amount again to upgrade.  Just
seems bad customer relations to me.

Adam Smith

In article <7rskd8$qan$2 at dragonfly.wolfram.com>,
  Ulf Saalmann <us at atom.msi.se> wrote:
> 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?
>
> Yes, the second result is correct only for positive a.
> But, how to tell it Mathematica (Version 3.0)?
> And how to tell Mathematica that a variable is real?
>
>   Thanks
>           Ulf  (us at atom.msi.se)
>
>


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