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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.

One of the contributing editors introduces the Developers' Area.

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.
This interactive, browser-based game provides students with a great activity for the "reform calculus" problem of finding "function-derivative pairs" based only on graphs. Several variations are available.
In this article, a very simple model is used to describe and generate many types of seashell shapes.
This is a module for use in differential or integral calculus. It looks at a differential equation model for world population growth.
A Biological ESTEEM module in the Ecology Category. This worksheet simulates the population growth of two interacting species.
This article uses a game, called Google-opoly, played on a small directed graph to describe and model the Google PageRank algorithm.

A module that uses Riemann sums and other numerical methods to investigate of the area of a complex region, specifically, a map of Virginia

This application allows linear algebra exercises to be completed using a server side program, which makes the tools browser independent. Every step of each solution is fully explained.