Re: Proposal: 6NF

From: vc <boston103_at_hotmail.com>
Date: 19 Oct 2006 16:38:17 -0700
Message-ID: <1161301097.608017.132040_at_f16g2000cwb.googlegroups.com>


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 Fri Oct 20 2006 - 01:38:17 CEST

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