Re: Relation Definition
From: Jan Hidders <jan.hidders_at_REMOVETHIS.pandora.be>
Date: Tue, 22 Feb 2005 20:13:03 GMT
Message-ID: <jnMSd.18496$Qp7.2127053_at_phobos.telenet-ops.be>
>
> Why so? The header is a set -- so the elements i.e. the named typed
> attributes in a set are unique.
>
> That provides a possible vector interpretation of an n-Tuple.
Date: Tue, 22 Feb 2005 20:13:03 GMT
Message-ID: <jnMSd.18496$Qp7.2127053_at_phobos.telenet-ops.be>
Anith Sen wrote:
>>>No, that cannot be right because it would allow the same attribute name >>>to appear more than once.
>
> Why so? The header is a set -- so the elements i.e. the named typed
> attributes in a set are unique.
You defined them as pairs and in a set there can be two pairs with the same first component.
>>>http://mathworld.wolfram.com/n-Tuple.html
>
> That provides a possible vector interpretation of an n-Tuple.
It is not "an interpretation", it is the standard definition of a tuple as used by mathematicians.
- Jan Hidders