How do I define a range of a symbol?
- To: mathgroup at christensen.cybernetics.net
- Subject: [mg876] How do I define a range of a symbol?
- From: hsvrt@uunet
- Date: Thu, 27 Apr 1995 01:48:40 -0400
- Organization: University of Bergen, Norway
Can anyone help me with the following (probably elementary) problem: Is it possible to specify a range of a constant, e.g. 0 < k < Infinity, or 0 < k < 100, or k not equal to 0 in a Mathematica session? I use Mathematica to do some heavy symbolic computation, and problems occur because Mathematica doesn't dare to do simplifications in which you have to assume that k is positive, not-zero etc. Is there also a way to give Mathematica qualitative information about functions in order to improve calculation of limits etc? For instance, if f: R->R increases on R, then lim f(x) / Exp[f[x]] = 0 as x approaches (+) Infinity. But how do I instruct Mathematica to understand this? Please help me, Roger Strand Dept of Biochemistry and Molecular Biology University of Bergen, Norway e-mail roger.strand at svt.uib.no