Imaginary number
From Conservapedia
An imaginary number in mathematics is any number that contains the imaginary unit, defined as, i2 = − 1
An imaginary number is of the form, ki, where k is a real number.
For example 
has imaginary representation of
.
When a imaginary number is added to real number, they form a complex number.
The analysis of imaginary numbers forms the basis for the field of mathematics known as complex analysis.
