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. > >

**References**:**Mathematica Question***From:*"Bharat Bhole" <bbhole@gmail.com>