Cardinality is a mathematical term. It translates into the number of elements in a set. In databases, cardinality refers to the relationships between the data in two database tables. Cardinality defines how many instances of one entity are related to instances of another entity. Below, we give ...
Let M be a matroid on E and 0 be an element not in E. The matroidM0is the direct sumM + {0} on the setE∪ {0}, where {0} is the matroid of rank zero on the single-element set {0}. We use the same symbol 0 for the zero of any matroidM0. ...
Therefore, we introduce an interval language to express cardinality intervals (l, u) as pairs of lower and upper cardinality bounds, both given by nat- ural numbers, or, in case of upper bounds, also by the special symbol * denoting unbounded cardinality. By convention, k < * holds for ...