NonEuclid - Hyperbolic Geometry Article + Software Applet
NonEuclid is Java Software for Interactively Creating Ruler and Compass Constructions in both the Poincare Disk and the Upper Half-Plane Models of Hyperbolic Geometry for use in High School and Undergraduate Education. Hyperbolic Geometry is a geometry of Einstein's General Theory of Relativity and Curved Hyperspace.
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