MathGroup Archive 1997

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Variable ranges

  • To: mathgroup at
  • Subject: [mg6818] Variable ranges
  • From: Chad Williams <williace at>
  • Date: Mon, 21 Apr 1997 02:02:49 -0400 (EDT)
  • Organization: The University of Alabama in Huntsville
  • Sender: owner-wri-mathgroup at


Can variables in 2.2.3 and/or 3.0 be defined with a certain range (e.g.
real and positive)?  If so how?

A place where this commonly is useful is symbolic integration.  The
classic example is:

Integrate[Exp[-a x^2], {x, -Infinity, Infinity}] where a>0 and real.

There are many other cases where range definitions are useful.  I am
currently doing a lot of symbolic convolution, autocorrelation, and
Fourier transform integration.


Jason Auxier
Optical Sciences and Engineering
University of Alabama in Huntsville

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