Knowledge points of mathematics set in senior one: the concept of set, the characteristics of elements about set, the relationship between elements and sets, commonly used number sets and their notation, the classification of sets, the expression methods of sets (natural language method, enumeration method and description method), the basic relationship between sets, and the basic operations of sets (intersection, union, complete set and complement set).

Basic concepts of set operation:

1. Union: A general set consisting of all elements belonging to set A or set B is called the union of sets A and B, and marked as A ∪ B. ..

2. Intersection: generally, there is a set consisting of all elements belonging to set A and set B, which is called the intersection of set A and set B, and is marked as A ∩ B. ..

3. Complete works: Generally speaking, if a set contains all the elements involved in the problem we are studying, it is called complete works, usually denoted as U.

4. Complement set: Set A, which consists of all elements in complete set U that do not belong to set A, is called the complement set of set A relative to complete set U, or the complement set of set A for short.