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Complete collection of mathematical symbols
A set is a population composed of some elements, which is called a set for short. The following is a summary of commonly used symbols in mathematics, hoping to help everyone.

Mathematical set of symbols 1, n: non-negative integer set or natural number set {0, 1, 2, 3, …}.

2, N* or N+: positive integer set {1, 2, 3, ...}

3, z: integer set {…,-1, 0, 1, …}

4. Q: Rational number set

5.Q+: Positive Rational Number Set

6.Q-: set of negative rational numbers

7.r: set of real numbers (including rational numbers and irrational numbers)

8.R+: positive real number set

9.R-: negative real number set

10, c: complex set

1 1、? : empty set (a set without any elements)

What are the types of union? A set with elements belonging to A or B is called the union 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

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 ∩.

Infinite set: Definition: A set containing infinite elements in a set is called an infinite set.

Finite set: let N+ be a positive integer, Nn={ 1, 2,3, ..., n}. If there is a positive integer n that makes the set A correspond to NN one by one, then A is called a finite set.

Difference: The set of elements belonging to A but not to B is called the difference between A and B (set).

Complement set: A set consisting of elements belonging to the complete set U but not to the set A is called the complement set of the set A, and is denoted as CuA, that is, CuA={x|x∈U, and x does not belong to A}.