Two sets A and B are said to be disjoint if their intersection is the empty set. The empty set is disjoint from every set. The union of disjoint sets is always a superset of each of the original sets (as long as the sets are finite).
Two sets A and B are said to be disjoint if their intersection is the empty set. The empty set is disjoint from every set. The union of disjoint sets is always a superset of each of the original sets (as long as the sets are finite).