Positive integer set

Mathematical terminology

The set of positive integers is all Positive number The set of numbers that are integers is Set of natural numbers The set excluding 0 in the, up to infinity. Common symbols of positive integer set N + 、 N *、 N 1、 N＞ 0 means.

Chinese name: Positive integer set
Foreign name: Positive integer set

Represent: Number axis representation
Direction: Direction
Symbol: Symbols N+, N *, N1, N>0

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In mathematics, there are positive numbers and negative numbers Number axis Indicates that the starting point is the origin 0, the arrow pointing to the direction (usually the right) is a positive number, and the arrow pointing backward (usually the left) is a negative number; A set is a structure that includes several objects (can include 0 objects, that is empty set )。

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The set of positive integers can be signed N + 、 N *、 N one 、 N≥0 express. Among them, N express Set of natural numbers ， Z express Integer set ， + It means that the elements in the data set are all positive numbers, and * means that the element 0 in the data set is excluded (for example, R *Denotes rejection R The number set after element 0 in, that is R *= R \{0}= R - ∪ R + =（-∞，0）∪（0，+∞）)。

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