The meaning of intersection is that a set consisting of all elements belonging to both set A and set B is called the intersection of set A and set B.

1, the intersection of two or more sets in mathematics, that is, the quantity that belongs to several sets or satisfies several conditions at the same time.

2. The intersection of A and B is written as A ∩ B. Formally, X belongs to A ∩ B. For example, the intersection of sets {1, 3,7} and {2,3,7} is {3,7}. If the intersection of two sets A and B is empty, that is, they have no common elements, then they do not intersect, so there is no intersection.

3. Set operation: commutative law: A∩B=B∩A, A ∪ B = B ∪ A

Law of association: (A∩B)∩C=A∩(B∩C), (A∪B)∪C=A∪(B∪C).

Distribution law: A∩(B∪C)=(A∪B)∩(A∪C), A ∪( B∪C)=(A∪B)∩(A∪.