1, United?

Given two sets A and B, the set formed by merging all their elements is called the union set of set A and set B, marked as A∪B, which is pronounced as A and B?

2. Intersection

In set theory, let A and B be two sets, which are composed of all elements belonging to set A and set B, called the intersection of set A and set B, and recorded as a ∩ b?

The difference between union and intersection:

1 has different meanings.

It doesn't mean addition A set consisting of all the elements of two sets is the union of the two sets. Intersection means common meaning, and the set composed of common elements in two sets is the intersection of these two sets.

2. The meaning is different.

Union set: The set whose elements belong to A or B is called the union (set) of A and B, marked as A∪B (or B∪A), and pronounced as A and B (or B and A), that is, A∪B={x|x∈A, or X.

Intersection: The set with elements belonging to A and B is called the intersection (set) of A and B, marked as A∩B (or B∩A), and read as "A crosses B" (or "B crosses A"), that is, A∩B={x|x∈A, X ∩.

3. Different in nature.

A union is a set consisting of all elements of two or more sets (only one repetition), and an intersection is a set consisting of all elements of two or more sets.