Re: Binary Relational Modeling call
Date: Tue, 20 Sep 2011 08:31:17 -0700 (PDT)
Message-ID: <59833c95-02d2-4df0-8eac-2d4b7a107562_at_a7g2000yqb.googlegroups.com>
On 17 sep, 08:15, Bob Badour <b..._at_badour.net> wrote:
> Ivan wrote:
> > wiki:
> > "A relation is a data structure which consists of a heading and an unordered set of tuples which share the same type."
>
> > wiki:
> > "In mathematics, a binary relation on a set A is a collection of ordered pairs of elements of A. In other words, it is a subset of the Cartesian product A2 = A × A. More generally, a binary relation between two sets A and B is a subset of A × B."
>
> > says nothing about difference between "relation" and "relationships".
> > binary relations? exactly what i have in mind: every binary relation can be implemented as table of pairs (2 field tuples) of references to sets' elements.
>
> What does the ever-so-omniscient wiki way about n-ary relations?
And why "references to sets' elements" instead of just "sets' elements" ????????? Received on Tue Sep 20 2011 - 17:31:17 CEST