Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsAdding Points on an Elliptic Curvehttp://demonstrations.wolfram.com/AddingPointsOnAnEllipticCurve/]]>http://demonstrations.wolfram.com/AddingPointsOnAnEllipticCurve/