Re: imposing parameter assumptions
- To: mathgroup at smc.vnet.net
- Subject: [mg44196] Re: [mg44184] imposing parameter assumptions
- From: "Peter Pein" <nospam at spam.no>
- Date: Sun, 26 Oct 2003 00:41:50 -0400 (EDT)
- References: <200310251026.GAA16281@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Simplify[Sign[a^-3], a < 0] -1 use FullSimplify for harder problems. Peter Pein, Berlin petsie at arcAND.de replace && by || to write to me ----- Original Message ----- From: "drr7" <rondeau at uvic.ca> To: mathgroup at smc.vnet.net Subject: [mg44196] [mg44184] 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. > >
- References:
- imposing parameter assumptions
- From: "drr7" <rondeau@uvic.ca>
- imposing parameter assumptions