Re: RM and definition of relations/tuples

From: x <x_at_not-exists.org>
Date: Fri, 25 Nov 2005 14:56:00 +0200
Message-ID: <dm71l4$h79$1_at_domitilla.aioe.org>


"Martin Zapf" <Martin_Zapf_at_gmx.net> wrote in message news:dm6vhe$dcv$1_at_online.de...
> >
> > How you define the cartesian product ?
> >
> >
>
> Im used to the "classic" definition wich I learned in school and
> university. You can find this definition at paragraph 'Cartesian square
> and n-ary product' on http://en.wikipedia.org/wiki/Cartesian_product.
> Consider that the pairs or Tuples are ordered in this defintion.
> E.g. element (1,2,3) of the cartesian Product IN^3:=IN x IN x IN is
> unequal to element (3,2,1) of IN^3.

Look at "Infinite products" at the same URL. Take I as the finite set {1,2,3}.
Then model the cartesian product IN^3:=IN x IN x IN Received on Fri Nov 25 2005 - 13:56:00 CET

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