Joel Castellanos, a graduate student at the University of New Mexico, in cooperation with a professor and another graduate student, is the author of the Java applet NonEuclid. Intended for high school and undergraduate students, the "software is a simulation of a non-Euclidean Geometry called Hyperbolic Geometry." This is most commonly associated with Einstein's General Theory of Relativity and topology. The NonEuclid home page has good documentation, examples, and activities for using the applet, but perhaps the most useful parts of the site are the basic concepts. These give a good introduction to Hyperbolic Geometry and help the user understand what is represented in the NonEuclid simulation.
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