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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