complex number
complex quantity
imaginary number
imaginary

Both and are expressed in complex numbers without any units.

Over the field of real or complex numbers, more is true.

Here one is working with a vector space over the complex numbers.

When working in a space over the complex numbers, one can go further as well and it is even easier.

Let and be two complex numbers whose ratio is not real.

A complex number is made up using two numbers combined together.

The complex numbers can be drawn on a number plane.

Most commonly this space will be the real or complex numbers.

The most important case is the field of complex numbers.

One may also look for solutions in the field of complex numbers.