On Fri, Jun 12, 2009 at 09:17:29AM +0100, John Cremona wrote:
>
> 2009/6/12 Rob Beezer <goo...@beezer.cotse.net>:
> >
> > Hi John,
> >
> > Thanks for the reply, the suggestions and the examples. I've seen the
> > Factorization object and briefly thought of building a Spectrum
> > object, but thought it sounded like overkill. But maybe I can just
> > subclass Factorization and override the _repr_ method (or similar) to
> > print the spectrum without the multiplication symbols, etc.
>
> I think there's a case for having a more basic class for holding
> "things with multiplicities"; the the spectrum could be one of these
> (or a class derived from it) and Factorization would also be a derived
> class.
>
> For example, I believe that the Factorization class is used to hold
> direct sum decompositions of modular symbol spaces (i.e. direct
> summands of some module) where some of the class makes sense but not
> all of it (not the unit factor, for a start); this could be instead
> an element of our more basic class, or of another derived class
> specifically for DirectSumDecompositions.
+1. We definitely need a good class for multisets.
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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