Imaginary Number

A Complex Number which has zero Real Part, so that it can be written as a Real Number multiplied by the ``imaginary unit'' i (equal to $\sqrt{-1}$).

See also Complex Number, Galois Imaginary, Gaussian Integer, i, Real Number

References

Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, pp. 211-216, 1996.