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system of simultaneous equations


WHile I've got the attention of a Mathematica expert, I am wanting to 
select a single root of a system of simultaneous equations (with 
positive values for all 3 variables) - and (being new to mathematica) 
cannot work out how to do this. I successfully get a list of roots, but 
cannot make the (you would think) easy step to reduce the list to 
only (positive) roots. Any help VERY gratefully received. I have 
searched in Mathgroup at Wolfram without finding anything.

Cheers


David Braunholtz
Department of Public Health & Epidemiology
Public Health Building
University of Birmingham
Birmingham B15 2TT
E-Mail:  D.A.Braunholtz at bham.ac.uk
Tel: 0121-414-7495
FAX: 0121-414-7878


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