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- Dave's short course on Complex Numbers - David Joyce; Clark University
An introduction to complex numbers, including a little history (quadratic and cubic equations; Fundamental Theorem of Algebra, the number i) and the mathematics (the complex plane, addition, subtraction; absolute value; multiplication; angles and polar coordinates; reciprocals, conjugation, and division; powers and roots), and intended for a general audience having a familiarity with ordinary real numbers (all positive and negative numbers and zero) and algebra.
- Imaginary Numbers - Math Forum, Ask Dr. Math FAQ
What is an imaginary number? What is i?
- John and Betty's Journey into Complex Numbers - Matt Bower
A children's book-on-the-Web from Australia, designed to introduce complex numbers in story form in a way that is intuitive and enjoyable for students. John, Betty, and their dog Trevor solve a series of problems designed to introduce integers, fractions, surds, imaginary numbers, complex numbers, Argand diagram; vectors, multiplication in polar form, relating polar and Cartesian form, De Moivre's theorem; and the Mandelbrot set.