Re: [Axiom-developer] Set Any and SXHASH

[Waldek Hebisch]

Bill Page wrote:
> On April 5, 2007 1:04 PM Waldek Hebisch wrote:
> > 
> > Bill Page wrote:
> > > 
> > > If Set is implemented by sorting the linear order cannot be
> > > domain specific since there certainly are domains from which
> > > we might wish to form finite sets for which no "natural" order
> > > can be defined, e.g. the domain Any. But I think it is always
> > > possible to define some lexical ordering over the members of
> > > all domains For example, the Axiom interpreter contains the
> > > Lisp function LEXGREATERP in
> > > 
> > >   src/interp/ggreater.lisp.pamphlet
> > > 
> > > For the implementation of Set using sorting all that is required
> > > is that the ordering be constant within an Axiom session.
> > >
> > 
> > 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.

-- 
                              Waldek Hebisch
address@hidden