Hi,
That is called a functional relationship.
A functional relationship states that there is only one unique y in (xRy) for
every x.
- e.g. Social Security Number, Father, BornIn
Inverse functional relationships are that there is a unique x in (xRy), for
every y.
See ya,
Marko.
http://markorodriguez.com
On Jul 12, 2011, at 9:39 AM, Niels Hoogeveen wrote:
>
> Does anyone know the proper mathematical name for a relationship with the
> following properties:
> For all x in X and y in Y it holds that if xRy and xR'y then R = R'.
> Example:
> There can be only one IS_PARENT relation from one person to another. Someone
> cannot be twice parent to the same person.
> There can be several IS_PRESIDENT_OF relations from one person to an
> organization. Someone can be president of an organizations from 1992-1997 and
> again from 2004-2008.
> Niels
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