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MathGroup Archive 2006

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Re: Mathematica Question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66402] Re: [mg66358] Mathematica Question
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Thu, 11 May 2006 02:16:22 -0400 (EDT)
  • References: <200605101034.GAA21918@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Bhart,
use Reduce

Reduce[{x^2 >= 0}, {x}, Reals]
True

Reduce[{Z1 + Z2 =B2 x, Z1 + Z3 =B2 x}, {Z1, Z2, Z3}, Reals]
Z2 =B2 x - Z1 && Z3 =B2 x - Z1

Adriano Pascoletti

On 10 mag 2006, at 12:34, Bharat Bhole wrote:

> Hello:
>
> Is there a way in Mathematica to check whether an algebraic 
> expression is
> positive or negative, and a way to specify conditions on the 
> variables in
> the expression? For example, is there a way to check whether x^2 is 
> positive for any real x? I want to check this for a complicated
> expression...basically the sign of the second derivative of a 
> function.
>
> Thank you very much for your help.
>
> Bharat.
>
>


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