Re: Proposal: 6NF

Marshall wrote:
> On Oct 19, 10:42 am, "vc" <boston..._at_hotmail.com> wrote:
> >
> > Any math binary operation should map pairs of values from some set to a
> > value in the same set (SxS -> S), that's the essential property of the
> > math structures known from one's school years, such as the natural
> > numbers, the set of ntegers, the set of rationals, the set of reals,
> > the complex numbers, etc,
>
> Wouldn't this then say that it was impossible to subtract
> two natural numbers? Or are you saying subtraction of
> natural numbers is not a "math binary operation?"

It means trivially that subtraction is not defined on the entire domain of the natural numbers.

What is 2 -5 ?

>
>
> Marshall
Received on Thu Oct 19 2006 - 18:38:17 CDT