What more than the following are you proposing?
sage: version()
'Sage Version 4.6.2.alpha0, Release Date: 2011-01-13'
sage: NN
Non negative integer semiring
sage: latex(NN)
\Bold{N}
John
On 19 January 2011 12:23, Florent Hivert <florent.hiv...@univ-rouen.fr> wrote:
> Hi there,
>
> In combinatorics, we very often use the set of non negative integers. It is
> currently implemented in sage as NonNegativeIntegers(). Note that it is only a
> facade parent, that is element it generate are plain standard sage Integer
> with parent ZZ. We'd like to have it standard in the interface under the name
> NN as well as a standard latex macro. Is there any objection to that ?
>
> Cheers,
>
> Florent
>
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