Re: I think my book may be wrong about cardinality, but I'm not sure

From: Bruce C. Baker <>
Date: Thu, 26 Jul 2007 09:38:04 -0500
Message-ID: <mk2qi.12038$rH6.398_at_newsfe22.lga>

"Cimode" <> wrote in message
> On 26 juil, 03:13, "Bruce C. Baker" <>
> wrote:


>> Each tuple in a relation with N attributes corresponds to a point in an
>> N-dimensional space, with each attribute being orthogonal to all of the
>> others.

> What does that mean ? How is a single attribute orthogonal to N-1
> attributes part of the same relation?. What do you exactly designate
> as *orthogonality*? Why would a tuple necessarily be a point and not
> a line ofr plane in geometrical N-space?
> What about degree 0/1 relations? How does a degree 0 relation
> represent a point in space?

The answers to all your questions can be found in any linear algebra textbook. Received on Thu Jul 26 2007 - 16:38:04 CEST

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