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Test the sign

• To: mathgroup at smc.vnet.net
• Subject: [mg4311] Test the sign
• From: "Daniel J. Rogers" <drogers at econ.sbs.utah.edu>
• Date: Tue, 9 Jul 1996 00:48:38 -0400
• Sender: owner-wri-mathgroup at wolfram.com

I am trying to evaluate the signs of some 
symbolic expressions.  The following is
a simple example.

Suppose:

a > 0
b > 0
c > 0
0 < d < 1

We know that a*b*c - a*b*c*d >0

Can I define the variables in such a way that
Mathematica can evaluate the expression.

Thanks,  Dan Rogers





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