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An article in which the focus-locus, focus-directrix, and cone-slicing descriptions of ellipses are related by way of the space-time geometry of special relativity.

The curve traced out on a baseball by its seam has many symmetries. This article explores the class of closed spherical curves with the same symmetries, which we call generalized baseball curves.

This utility uses the free Flash player plug-in resident in most browsers to allow the user to plot parametrically defined surfaces in cylindrical coordinates. Many examples and directed exercises are included.

An article on Group Explorer, a system that uses graphical representations of groups to build intuition.

A mathlet to sketch a derivative function by hand or by recording slopes of tangent lines.
Three applets allow you to interact with the puzzle described in the April 2009 Mathematics Magazine article by Alex Fink and Richard Guy.
A Biological ESTEEM module from the Ecology Category. This Excel workbook uses the Leslie Matrix Model for population projection of age-class or stage-class structured populations.
The Mathematical Association of America has found the new Editor to succeed David Smith as the Editor of JOMA.
Loci has a new Editor!
This Flash Forum article includes source code and modification instructions that will allow you to customize a grapher for surfaces in space.