MINIMUM-VALUE-CARDINALITY specifies a lower bound on the number of range elements to which a given relation can map instance of a given domain class. In other words, it is the minimum number of slot values for a slot local to a class.
(<=> (Minimum-Slot-Cardinality ?Domain-Class ?Relation ?N) (=> (Instance-Of ?Instance ?Domain-Class) (>= (Value-Cardinality ?Instance ?Relation) ?N)))
(Nth-Domain Minimum-Slot-Cardinality 3 Nonnegative-Integer) (Nth-Domain Minimum-Slot-Cardinality 2 Binary-Relation) (Nth-Domain Minimum-Slot-Cardinality 1 Class)
(<=> (Minimum-Slot-Cardinality ?Domain-Class ?Relation ?N) (=> (Instance-Of ?Instance ?Domain-Class) (>= (Value-Cardinality ?Instance ?Relation) ?N)))
In KEE, MINIMUM-SLOT-CARDINALITY is called MIN.CARDINALITY.