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It now supports complex numbers z = x + i y and shows them in the complex plane so you can easily visualize multiplication, addition, etc graphically.

MathCS provides many resources for anyone interested in Mathematics, Statistics, Java Programming, or Robotics. Each resource has a discussion board where you can leave comments or questions, read answers provided by others, or leave your own answers. This site is supported by Google Ads - please click on any of the ads on the right occasionally to help maintain this resource.
Interactive
Real Analysis is an online, interactive textbook for Real
Analysis or Advanced Calculus. It deals with sets, sequences,
series, continuity, differentiability, integrability, topology, etc.
Android Tutorial
is an online, self-contained tutorial to create programs
for the Android operating system for small mobile devices such as cell
phones. It allows anyone to develop applications for the Android
system, and - if they are worthwhile - upload them to the Android marketplace.
Java,
a programming language introduced by Sun, is getting more and more
accepted as a teaching language. Here you can find resources,
applets, source code, as well
as a complete online textbook
Java by Definition to learn Java
from the ground up.
Statistics
is the science of making sense of data - quite a useful skill.
Even more useful is this
online introductory stats course using Excel. If you know some
stats already, you will appreciate learning how to apply Excel's
power to statistics. and if you know Excel already, you will learn
about some of its hidden functionality and pick up some useful
statistics knowledge along the way - as we statisticians say:
"may all your statistics be significant".
Resources for an introduction to robotics. This
resource will include information on how to program the Lego NXT
Brick using Java (via LeJOS), including many sample programs, an
introduction to Microsoft Robotics Studio, how to program a Corobot
vehicle with a six-degrees-of-freedom arm, and some videos from a
robotics course I am teaching periodically.
Interactive
Complex Analysis is an online, interactive textbook for Complex
Analysis. It deals with complex numbers and topology, complex
functions, holomorphic functions and properties, singularities,
residues, conformal maps, harmonic functions, etc.