Michael Berkowitz wrote:

> Since it's a Saturday afternoon I'll ask the questions I've always wondered
> about.
>
> Is infinity minus infinity = zero, infinity or undefined?
>
> Is infinity divided by infinity = one, infinity or undefined?
>
> Is negative infinity plus positive infinity = 0, negative infinity, positive
> infinity, both or undefined?
>
> Mike Berkowitz
> Guess? Inc.
>
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Michael,


As Wirt already said the answer to all is: undefined.

But there are some hints on what the answer would be for specific cases.


For infinity/infinity you have to look at the functions that cause the
fraction.

Apply l' Hospital's rule stating that if f(x)/g(x)=infinity/infinity then
f(x)/g(x)=[df(x)/dx]/[dg(x)/dx]

For example: Limit x->infinity   log(x)/x = Limit x->inifinity [1/x]/1 = 0


In the other cases you have to look at the cause to:    limit x-> infinity
x-x*x = -infinity


--
Regards,

Jan Gerrit Kootstra
PinkRoccade Online
[These opinions and remarks are my own, and may not reflect our company policies.]

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