On Thu, Jun 26, 2003 at 01:02:06 -0400,
Mike Mascari <mascarm@mascari.com> wrote:
> > Hi,
> >
> > Just a quick question, not unrelated to my
> > previous question, which I don't think will
> > get answered. I have a table with 13 fields.
> > Is that too many fields for one table.
>
> Mathematically, a binary relation represents the relevant cross
> product of two domains, x and f(x):
A binary relation is a subset of the cross product of two sets.
This is more general than using x and f(x) since this implies some
restrictions on the subset (namely that there is only one tuple
with a specific member of x in the x part of the tuple).