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单词 ClassificationOfComplexNumbers
释义

classification of complex numbers


The set of all complex numbersMathworldPlanetmathPlanetmath and many of its subsets may bepartitioned (classified) into two subsets by certain criterion of the numbers.

A.  F i r s t   c l a s s i f i c a t i o n :

Complex numbers contain

  1. 1.

    algebraic numbersMathworldPlanetmath

  2. 2.

    transcendental numbersMathworldPlanetmath

Algebraic numbers contain

  1. 1.

    algebraic integersMathworldPlanetmath ( algebraic numbers)

  2. 2.

    algebraic fractions (fractional algebraic numbers)

Algebraic integers contain

  1. 1.

    rational integers

  2. 2.

    non-rational integers

Algebraic fractions contain

  1. 1.

    rational fractions

  2. 2.

    non-rational fractions

Transcendental numbers contain

  1. 1.

    real transcendental numbers

  2. 2.

    imaginary transcendental numbers


B.  S e c o n d   c l a s s i f i c a t i o n :

Complex numbers contain

  1. 1.

    real numbers (http://planetmath.org/RealNumber) (the set )

  2. 2.

    imaginary numbers (i.e. non-real complex numbers)

Real numbers contain

  1. 1.

    rational numbersPlanetmathPlanetmath (the set )

  2. 2.

    irrational numbers

Rational numbers contain

  1. 1.

    integers (http://planetmath.org/Integer) (the set )

  2. 2.

    fractional numbers

Imaginary numbers contain

  1. 1.

    pure imaginary numbers (with real partMathworldPlanetmath 0)

  2. 2.

    other imaginary numbers (with real part 0)

One can also combine the criterions of A and B; thus e.g.the irrational numbers consist of the algebraic irrational numbers andthe irrational numbers.

In , any of the sets , and may be partitioneded into positive numbers, negative numbers and 0 (http://planetmath.org/Null).

Number-theoretically, the set consists of four of integers:
1o  the number 0,
2o  the units of (only +1 and -1),
3o  the prime numbersMathworldPlanetmath  (±2,±3,±5,±7,±11,),
4o  the composite numbersMathworldPlanetmath  (±4,±6,±8,±9,±10,)

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更新时间:2025/5/4 15:59:51