MathGroup Archive 1997

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How to use inequalities with Solve?

  • To: mathgroup at
  • Subject: [mg5754] How to use inequalities with Solve?
  • From: Michael Hucka <hucka at>
  • Date: Tue, 14 Jan 1997 10:42:30 -0500
  • Organization: University of Michigan EECS, Ann Arbor, Mich., USA
  • Sender: owner-wri-mathgroup at

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     <URL:>
 Ph.D. candidate, computational models of human visual processing, U-M AI Lab
     UNIX admin & programmer/analyst, EECS Dept., University of Michigan

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