Re: RM formalism supporting partial information
From: Alfredo Novoa <alfredono_at_gmail.com>
Date: Tue, 20 Nov 2007 09:47:48 -0800 (PST)
Message-ID: <60726d4d-276f-4fe5-bccb-7d229966ce43_at_n20g2000hsh.googlegroups.com>
Date: Tue, 20 Nov 2007 09:47:48 -0800 (PST)
Message-ID: <60726d4d-276f-4fe5-bccb-7d229966ce43_at_n20g2000hsh.googlegroups.com>
Hi,
On 16 nov, 18:44, Bob Badour <bbad..._at_pei.sympatico.ca> wrote:
> > In a tuple I would call "tuple elements" to the pairs formed by name
> > and value.
>
> I am not sure the name is necessarily part of the element other than to
> identify it.
But identification is essential.
> I am not sure if that is clear enough. In mathematics, we
> sometimes use names and we sometimes use position to identify the
> elements of tuples.
In "traditional" mathematics we use positions, in RM mathematics we use names to identify the elements of tuples. This is one of Codd's aportations. RM tuples and "traditional" tuples are not the same mathematical constructions.
Regards
Alfredo
Received on Tue Nov 20 2007 - 18:47:48 CET