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imposing parameter assumptions

• To: mathgroup at smc.vnet.net
• Subject: [mg44184] imposing parameter assumptions
• From: "drr7" <rondeau at uvic.ca>
• Date: Sat, 25 Oct 2003 06:26:39 -0400 (EDT)
• Organization: University of Victoria
• Sender: owner-wri-mathgroup at wolfram.com

Simple question:  How do I impose assumptions on the sign of parameters in
symbolic equations and then test for the sign of an expression. Example:
suppose I want to test the sign of f[a]=a^-3 if a<0.  I tried combinations
of Refine and Positive, but that does not seem to work for me.  What I am
really trying to do is sign a long expression for a derivative.
Thanks.

• Follow-Ups:
  • Re: imposing parameter assumptions
    • From: "Peter Pein" <nospam@spam.no>