Imaginary numbers are divided into general imaginary numbers with non-zero real part and pure imaginary numbers with zero real part; There is no positive or negative difference between imaginary numbers;
Real numbers are divided by sign: positive real numbers, zero real numbers and negative real numbers.
Extended data
Natural number: positive integer from 0, 1, 2, 3, 4, 5, 6. ..
Integer: including positive integer, 0, negative integer,. -5, -4, -3, -2, - 1, 0, 1, 2, 3, 4, 5.
Rational numbers, including integers and decimals (excluding infinitely circulating decimals), are generally understood as numbers that can be written as fractions, and all rational numbers can represent component numbers.
Irrational number: infinite acyclic decimal, which cannot be expressed in fractional form, such as pi, root number 2, etc.
Real number: Real number is a general term for rational number and irrational number.
Complex number: Complex number refers to a+bi, which can be written in the following form, where A and B are real numbers and I is imaginary unit (i.e.-1 root).