# Re: MV Keys

Date: 2 Mar 2006 09:41:46 -0800

Message-ID: <1141321306.850153.41980_at_v46g2000cwv.googlegroups.com>

x wrote:

> "Marshall Spight" <marshall.spight_at_gmail.com> wrote in message

*> news:1141267829.869557.170030_at_t39g2000cwt.googlegroups.com...
**> > David Cressey wrote:
**> > > "Marshall Spight" <marshall.spight_at_gmail.com> wrote
**> > >
**> > > > To my current way of thinking, there are only the two compound types:
**> > > > list and set.
**> > >
**> > > A tuple is a compound type. And I don't think a tuple is either a list
**> or a
**> > > set.
**>
**> > An n-ary tuple is an n-ary relation whose cardinality is constrained to
**> > be exactly 1. Lots of people hate this idea, but it seems to work
**> > very well.
**>
**> An n-ary tuple is an 2-ary relation whose cardinality is constrained to
**> be exactly n. Lots of people hate this idea, but it seems to work
**> very well.
*

I *did* say there were many valid ways to think about it. :-)

OTOH, the viewpoint I suggested is both practical and convenient. But these are design issues, not theoretical ones.

Marshall Received on Thu Mar 02 2006 - 18:41:46 CET