Disjointness can be generalized to several sets in more than one way. One possibility is the notion of pairwise disjoint: a number of sets are pairwise disjoint if every pair of the sets are disjoint. For example, the three sets , and are pairwise disjoint. Alternatively, one can ask for the weaker condition that the sets have empty intersection. For instance, the three sets , and have empty intersection but are not pairwise disjoint.
This article is a stub. Help us out by.