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MathGroup Archive 1999

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Real roots and other assumptions...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19883] Real roots and other assumptions...
  • From: Janus Wesenberg <jaw at imf.au.dk>
  • Date: Sun, 19 Sep 1999 18:47:33 -0400
  • Organization: Departments of Mathematical Sciences, University of Aarhus
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
I keep encountering problems of the following type when using mathematica:
I want to solve some equation(s) under some assumptions about the unknown(s),
e.g. find the real roots of (x-1)(x^2+1).
I've tried Solve[{Im[x]==0,(x-1)(x^2+1)==0},x]] for the above problem, but that
doesn't get me anywhere.

Is there a general way to let Mathematica know about such additional bounds as
non-complexness etc? -- if so I would be happy to know it!

Janus Wesenberg
Student of Physics.

PS. I'm using Mathematica from a HP-UX 10 system, and the notebook interface
have grave difficulties handling large expressions (they scrambled to complete
nonsense). The local system administrator just says "Use the text access", but
does anyone know how to make the notebook interface work?


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