Some commonly used number sets in mathematics and their representations;

The set composed of all nonnegative integers is called nonnegative integer set (or natural number set), and is denoted as n;

The set of all positive integers except zero is called a positive integer set, and it is recorded as N* or N+(“+ ("+"(marked with "+"in the lower right corner);

The set composed of all integers is called integer set, which is denoted as z;

The set of all rational numbers is called rational number set, and it is recorded as q;

The set of all real numbers is called the set of real numbers, and is denoted as r 。

The set of all imaginary numbers is called the imaginary number set, and it is recorded as c:

There are irrational number sets and so on.

A point set is a collection of points. You know, points are represented by (x, y). Many points are put together to form a point set. For example, {(2,4), (10, -5), (0,0), (3,4)} means (2,4), (65438).

Number set is a set of numbers, and point set is a set of point coordinates.

For example, {0, 1, 4, 100, -5} is a number set.

{( 1, 1), (-3,5), (0,0), (4,23)} is a point set.