Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsA Remarkable Formula Of Ramanujanhttp://demonstrations.wolfram.com/ARemarkableFormulaOfRamanujan/]]>http://demonstrations.wolfram.com/ARemarkableFormulaOfRamanujan/A Function Invariant under a Group of Transformationshttp://demonstrations.wolfram.com/AFunctionInvariantUnderAGroupOfTransformations/]]>http://demonstrations.wolfram.com/AFunctionInvariantUnderAGroupOfTransformations/