On Wed, Feb 22, 2012 at 2:24 PM, mario <mario.pernici@xxxxxxxxx> wrote:

> Another strange behavior is
>
> ```
> >>> S(0)**0
> 1
> ```
>
>
From:
0**0<http://www.askamathematician.com/2010/12/q-what-does-00-zero-raised-to-the-zeroth-power-equal-why-do-mathematicians-and-high-school-teachers-disagree/>:
There
are some further reasons why using [image: 0^0 = 1] is preferable, but they
boil down to that choice being more useful than the alternative choices,
leading to simpler theorems, or feeling more “natural” to mathematicians.
The choice is not “right”, it is merely nice.



> while correctly
>
> ```
> >>> S(0)/S(0)
> nan
> ```
>
>
Yes, division by zero is undefined.

So I think these two are ok.

/c

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