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MathGroup Archive 1993

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0^t

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: 0^t
  • From: gafox at convx1.ccit.arizona.edu (Gordon A. Fox)
  • Date: Wed, 02 Jun 1993 08:53:37 -0700

Dear Mathgroup,

	The following exchange between myself and Courtney Johnson
at WRI clarified something that bothered me, and may well bother
others. . . .

			Gordon A. Fox
			(gafox at convx1.ccit.arizona.edu)
			Dept. of Ecology & Evolutionary Biology
			University of Arizona
			Tucson, AZ 85721

*********************************************************************
	Mma is now generating output for me that includes terms like
	0^t, and it doesn't simplify these to 0. In fact, if I simply
	enter "0^t" or even N[0^t], the output is "0^t". Is there
	a way to fix this so I don't have to search my output and
	make the substitution 0^t->0??

				Gordon A. Fox
*********************************************************************

This is useful in some cases when, for instance, a person would
try to evaluate 0^0, which is not necessarily equal to 0.  So it is
incorrect, mathematically speaking, to evaluate to 0.  In any case,
if you would like it to function so that 0^t, where t is any number,
then you can do so with the following lines:

Unprotect[Power]
Power[0,t_] = 0
Protect[Power]

Please remember to change this back if you are finished and are
not needing that functionality anymore if you think that there is
a possibility in the future of your session that you will not want
it to automatically evaluate to 0.

Thank you for your continued interest in Mathematica.

Sincerely,

Courtney Johnson
Technical Support
*********************************************************************


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