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Re: How to use inequalities with Solve?

• To: mathgroup at smc.vnet.net
• Subject: [mg5771] Re: How to use inequalities with Solve?
• From: Daniel Lichtblau <danl>
• Date: Sat, 18 Jan 1997 14:58:27 -0500
• Organization: wolfram.com
• Sender: owner-wri-mathgroup at wolfram.com

Michael Hucka wrote:
> 
> OK, this is probably a stupid question, but I just can't seem to get it
> right.  I have a hairy expression that I'm trying to get Mathematica to solve
> using Solve (or Reduce), and in an effort to reduce the number of results,
> I'd like to express that certain variables are greater than zero.  Apparently
> I can't use the obvious thing:
> 
>     Solve[ expr == 0 && a > 0 && b > 0, x]
> 
> Is there some other way to achieve the same effect?  Seems like there *ought*
> to be a way.
> 
> --
> Mike Hucka     hucka at umich.edu     <URL: http://ai.eecs.umich.edu/people/hucka>
>  Ph.D. candidate, computational models of human visual processing, U-M AI Lab
>      UNIX admin & programmer/analyst, EECS Dept., University of Michigan

Solve and Reduce will not take inequalities.

In version 3.0 there is a standard package, Algebra`InequalitySolve`,
that may do what you want.

Daniel Lichtblau
Wolfram Research
danl at wolfram.com