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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.
A brief outline of policies for submission of articles to Loci.
A Biological ESTEEM module in the BioInformatics Category. This workbook allows the analysis of sample or imported protein sequences.

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

A mathlet to construct an antiderivative by accumulating area under the graph of a function.

This interactive page allows readers to construct a Kuratowski 14-Set on the real line by selecting from among ten checkboxes, each representing a given set of real numbers.

This applet encourages students to use the mathematics of the motion of a projectile to choose angle and velocity necessary to hit a roving target. The source code is available from the link within the Sharing Area of the Flash Forum.
The Mathematical Association of America has found the new Editor to succeed David Smith as the Editor of JOMA.

This article explores the symmetry method in elementary differential equations, which uses the invariance of the equation under certain transformations to create a coordinate system in which the equation greatly simplifies.

This ESTEEM module in the Biometrics Category is a collection of workbooks has tools for linear regression, polynomial fit, and chi-square analysis to test whether a data set is in Hardy-Weinberg Equilibrium.