NaN comparisons - Call For Anecdotes

Ian Kelly ian.g.kelly at
Fri Jul 18 01:00:44 CEST 2014

On Thu, Jul 17, 2014 at 3:08 PM, Marko Rauhamaa <marko at> wrote:
> Ian Kelly <ian.g.kelly at>:
>> Well, 0**0 is usually defined as 1, despite the limits being
>> ambiguous.
> <URL:>
>     But if it could be defined, what "should" it be? 0 or 1?

I did say "usually". There's not one single Holy Keeper of the
Definitions for mathematics. Wikipedia lists some differing opinions
on the subject:

I note that also lists it as undefined, though.

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