Re: Solving a system of Inequalities

• To: mathgroup at smc.vnet.net
• Subject: [mg39779] Re: [mg39764] Solving a system of Inequalities
• From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
• Date: Fri, 7 Mar 2003 03:31:04 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Mathematica has in fact a very rich collection of functions for solving
algebraic inequalities, but your message makes me doubt that that the
kind of solution you seem to expect to get for your system is actually
possible. You say that "InequalitySolve gives me a solution that is
more complicated than the problem itself". Actually InequalitySolve
represents the solution of a system in cylindrical form, which is
usually the most convenient for further processing. In general there is
nothing simpler available, although in special cases humans rather than
computer can find simpler representations. To decide if your case is
one of these one would have either to see the full problem or at least
a toy problem with the same sort of structure.

Andrzej Kozlowski
Yokohama, Japan
http://www.mimuw.edu.pl/~akoz/
http://platon.c.u-tokyo.ac.jp/andrzej/

On Thursday, March 6, 2003, at 04:36  pm, Christina Chan wrote:

> Hi,
> I have 192 linear inequalities containing 28 variables and I want to
> find the constraints for each of the variables. I am thinking about
> solving the system by eiliminating the variables one by one (similar
> to the Gaussian Elimination). Is there a way I can do it with
> Mathematica? The function InequalitySolve gives me a solution that is
> more complicated than the problem itself.Is there any other functions
> that might help? Thank you!!
>
> Christina
>
>
>

```

• Prev by Date: Re: Is Sort stable?
• Next by Date: Re: Emergent Help: NSolve Problems!
• Previous by thread: Solving a system of Inequalities
• Next by thread: Re: Solving a system of Inequalities