Features numerous exercises relating to complex and imaginary numbers. Includes video tutorials, calculators, worksheets and more.

Clearly and thoroughly explains complex numbers. Provides example problems and exercises for students, with solutions available.

The imaginary number (also called the imaginary unit) is defined as the square root of negative one. This site explains the rational for the existence of the imaginary number "i" and gives formulas involving "i" including Euler's...

Contains a short summary on imaginary numbers and several links to its related fields. Also provides several examples and explanations for understanding.

Learn about imaginary numbers with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.

Contains a brief summary on the origin of complex numbers.