Robert P. Munafo, 2002 May 29.
A value a + b i consisting of a real number added to an
imaginary number. The complex numbers are a generalized superset of
the reals in which any exponent, root or logarithm is permissable
(with the exception of extreme cases like taking the 0th root or the
logarithm to base 1)
Complex numbers are often represented as points on a plane, with
coordinates a and b. The real axis is oriented horizontally with
positive numbers to the right, and the imaginary axis runs vertically.
Complex numbers are also sometimes treated as having polar coordinates
(radius and angle).
From the Mandelbrot Set Glossary and Encyclopedia, by Robert Munafo. Mu-ency index
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