Union is a mathematical concept, and the set formed by the combination of two sets is called union. The existing sets A and B combine all their elements to form a new set, which is called the union of sets A and B, marked as A∪B and pronounced as A and B.

In mathematics, a set consisting of all elements belonging to both sets A and B is called the intersection of sets A and B, and it is marked as A ∩ B. If the intersection of sets A and B is empty, it means that they have no common elements. The intersection of any set and an empty set is an empty set, that is, A∩=.

In mathematics, a set consisting of all elements belonging to both sets A and B is called the intersection of sets A and B, and it is marked as A ∩ B. If the intersection of sets A and B is empty, it means that they have no common elements. The intersection of any set and an empty set is an empty set, that is, A∩=.

In mathematics, a set consisting of all elements belonging to both sets A and B is called the intersection of sets A and B, and it is marked as A ∩ B. If the intersection of sets A and B is empty, it means that they have no common elements. The intersection of any set and an empty set is an empty set, that is, A∩=.