Google Summer of Code

Robin Green greenrd at
Fri Jun 10 14:35:25 PDT 2005

On Fri, Jun 10, 2005 at 10:12:40PM +0200, Massimo Dentico wrote:
> Just to clarify.
> "Robin Green" <greenrd at> wrote:
> >No it doesn't. I already proved otherwise: that you can have Sets which 
> >aren't
> >Bags in both, and you can have Sets which *are* Bags in both, ***depending 
> >on how
> >you define a bag***.
> I wrote:
> >> A Set is a special case of a Bag and so is a Circle wrt an Ellipse,
> >> period. OO is supposed to mimic the ***application domain faithfully..***
> >> so why is it not able to render this subset relation properly?
> Emphasis added.
> Sets and Bags are mathematical concepts, you cannot arbitrary redefine
> them just to make happy your favorite OO language.

I think you're missing the point of what I was saying. I was careful not to
take a position on the "best" definition. *Either* definition proves my point.
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