Difference between revisions of "Complex number"
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| − | The set of '''complex numbers''' is denoted by <math>\mathbb{C}</math>. The | + | The set of '''complex numbers''' is denoted by <math>\mathbb{C}</math>. The set of complex numbers contains the set <math>\mathbb{R}</math> of the [[real number]]s but is much wider. Every complex numbers has, the '''real part''', denoted by <math>\Re</math> or simply <math>\mathrm{Re}</math>, and the '''imaginary part''', denoted by <math>\Im</math> or simply <math>\mathrm{Im}</math>, so, if <math>z\in \mathbb C</math>, we can write it as <math>z=\Re z+i\Im z</math> where <math>i=\sqrt{-1}</math>. |
The letters <math>z</math> and <math>\omega</math> are usually used to denote complex numbers. | The letters <math>z</math> and <math>\omega</math> are usually used to denote complex numbers. | ||
Revision as of 11:58, 22 June 2006
The set of complex numbers is denoted by 
. The set of complex numbers contains the set 
of the real numbers but is much wider. Every complex numbers has, the real part, denoted by 
or simply 
, and the imaginary part, denoted by 
or simply 
, so, if 
, we can write it as 
where 
.
The letters 
and 
are usually used to denote complex numbers.
Contents
Operations
- Addition
- Subtraction
- Multiplication
- Division
- Absolute value/Modulus/Magnitude (denoted by
). This is the distance from the origin to the complex number when graphed.
). This is the distance from the origin to the complex number when Simple Example
If 
and 
,
,
,
,
,
