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Marden's Theorem concerns the relative positions of the roots of a cubic polynomial and those of its derivative. This article gives a proof of Marden's theorem, along with dynamic geometry animations and some of the history of the result.

This paper uses graphics and animations to illustrate how to construct root and weight diagrams for Lie algebras, and how the root and weight diagrams can be used to identify subalgebras.

A Developers' Area article about reuse and interoperability of mathematical tools.
A Biological ESTEEM module from the Ecology Category. This worksheet compares user-input growth data with predictions under linear, exponential, and logistic models of growth.
This Java applet plots up to 10 functions simultaneously with zoom and trace features. It can be used to study properties of functions or approximate solutions to equations. The syntax for entering the functions is given on the accompanying web page.

This tutorial shows the details of composing the POV-Ray code necessary to generate the image of a dodecahedron, and to animate rotating the dodecahedron.

This module a standard model of population growth in a constrained environment.
Part of the MathDL OSSLET Collection, this flexible and easily-used applet can be used to investigate and animate up to three functions involving up to four parameters.
Editorial Board
Announcing completion of the transition from the "old" site at Math Forum to the "new" site at MAA