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Non linear System of inequalities

• To: mathgroup at smc.vnet.net
• Subject: [mg57238] Non linear System of inequalities
• From: azzam_maraee at hotmail.com
• Date: Sat, 21 May 2005 02:40:50 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

I need a help at solving Non linear System of inequalities in tree
variabels or more for example:
xy<=r<=2xy
xz<=r<=2xz
yz<=r<=2yz
and so on...
my Non linear System of inequalities  represent the constraints at at
some problem which I search (consistency of a model).

  is there any material or sites which may help me?
I will apreciate any help.