digital sort
Numbers generally refer to complex numbers, including real numbers and imaginary numbers.
"Complex number is the floorboard of real number and irrational number, written in the form of a+bi (A and B are both real numbers)"
"Real number is the general name of rational number and irrational number, and is denoted as R."
"Imaginary number is a complex number in the form of a+bi and B! =0。 』
"Irrational number is an infinite cycle of decimal. 』
"Rational numbers include infinite circulating decimals, finite decimals and integers. Write it down as "q"
The numbers in "…, -2,-1, 0, 1, 2, …" are called integers. All the integers form an integer set and are expressed as z "
"Natural numbers are positive integers, 1, 2, ..., and recorded as n" (now middle school textbooks define 0 and positive integers as natural numbers. This is just a random definition.
Since then, many definitions of number theory have been changed. )
1 "Real numbers are the floorboard of rational numbers and irrational numbers"
Real numbers have no imaginary part, which is a general term for complex numbers, rational numbers and irrational numbers.
Real numbers include rational numbers and irrational numbers.
"Real numbers are the floorboard of rational numbers and irrational numbers"
Irrational number is an infinite cycle decimal.
Rational numbers include infinite cyclic decimals, finite decimals and integers.
Irrational numbers are wireless acyclic decimals
& lt 1 & gt； Irrational algebraic number
3 under the second radical sign, 4 under the third radical sign, cos 10' are all irrational algebraic numbers.
& lt2> transcendental number
π π, the base of natural logarithm e, they cannot be reduced to roots, that is, they are not the roots of any integral coefficient equation. These figures include lg2.
2 to the power of (root number 2)
real number
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Algebraic transcendental number
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irrational
Imaginary number is a complex number in the form of a+bi and b! =0
3 organically combine imaginary numbers with real numbers and write them in the form of a+bi (both a and b are real numbers), which is called complex number.
Nouns such as complex number, real number, imaginary number, algebraic number and transcendental number can be found in Baidu Encyclopedia.