> On April 5, 2007 1:25 PM Waldek Hebisch wrote:
> > ...
> > > >
> > > > You need an order which is consistent with equality.
> > >
> > > I agree.
> > >
> > > > Since equality is domain-specific you need also domian-
> > > > specific order. I agree that we do not have one handy.
> > >
> > > I do not agree. What do you think is wrong with LEXGREATERP
> > > for this purpose?
> > >
> >
> > AFAICS LEXGREATERP compares representations, completly ignoring
> > equality from domain.
> >
>
> Yes. Why do you say that this would not be consistent with
> domain equality?
>
Domain elements may be mathematically equal but have different
representations. AFAICS this happens for example for general
fractions.
> What problems would occur if elements of all finite sets
> were ordered according to this ordering?
>
We may miss duplicates and declare equal sets as unequal.
--
Waldek Hebisch
[EMAIL PROTECTED]
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