Re: Proposal: 6NF

From: Marshall <marshall.spight_at_gmail.com>
Date: 19 Oct 2006 15:42:29 -0700
Message-ID: <1161297749.148249.152100@i42g2000cwa.googlegroups.com>

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?"

Marshall Received on Thu Oct 19 2006 - 17:42:29 CDT