MathGroup Archive 2003

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imposing parameter assumptions


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.



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