Cartesian product of anything with the empty set is empty. Which is why SQL has outer joins.
On 4/4/08, TSa <[EMAIL PROTECTED]> wrote: > HaloO, > > why is (1,2,3) X () defined to be the empty list > and not (1,2,3) as is the case with the cartesian > product of sets which X basically is with preserved > order. > > Regards, TSa. > -- > > The Angel of Geometry and the Devil of Algebra fight for the soul > of any mathematical being. -- Attributed to Hermann Weyl > -- Sent from Gmail for mobile | mobile.google.com Mark J. Reed <[EMAIL PROTECTED]>
