1 and natural number set are nonnegative integer sets. The set is called natural number set, and it is recorded as n;
2. The set of all positive integers is called positive integer set, and it is denoted as N*, Z+ or n+;
3. The set composed of all integers is called integer set, and is denoted as z;
4. The set of all rational numbers is called the set of rational numbers, which is denoted as Q;
5. The set of all real numbers is called the set of real numbers, which is denoted as R. ..
Extended data:
1, the set of all nonnegative integers is usually called the nonnegative integer set (or natural number set). Non-negative integer sets include natural numbers such as 0, 1, 2 and 3. Mathematically, non-negative integer sets are represented by the bold capital letter "n". Non-negative integers include positive integers and zeros. A set of nonnegative integers is a countable set.
2. A collection refers to a collection of concrete or abstract objects with certain attributes. These objects are called elements of a set, and a number set is a number set. The range of set is greater than that of number set, and number set is just one kind of set. What belongs to a number set must belong to a set, and what belongs to a set is not necessarily a number set.
3. Other episodes of Symbol Set:
(1) The set of all real numbers is called the real number set, and it is recorded as r;
(2) The set of all imaginary numbers is called the imaginary number set, and it is denoted as I;
(3) The set of complex numbers composed of all real numbers and imaginary numbers is called complex number set, and it is recorded as C. ..
References:
Baidu Encyclopedia _ Number Set