Complex Conjugate  -  The complex conjugate of a + bi is a - bi. When two complex conjugates are multiplied, the result is a² + b².

Complex Number  -  A number of the form a + bi, where i =

and a and b are real numbers.

Imaginary Number  -  A number of the form

, where k < 0, or a number of the form ki, where i =

.

Imaginary Part  -  The term bi of a complex number a + bi.

Real Part  -  The term a of a complex number a + bi.