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

On 26 juil, 16:38, "Bruce C. Baker" <b..._at_undisclosedlocation.net> wrote:
> "Cimode" <cim..._at_hotmail.com> wrote in message
>
> news:1185446387.854491.306850_at_w3g2000hsg.googlegroups.com...
>
> > On 26 juil, 03:13, "Bruce C. Baker" <b..._at_undisclosedlocation.net>
> > wrote:
>
> <snip>
>
> >> 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.

Really? Would you care providing a source? Received on Thu Jul 26 2007 - 17:16:04 CEST