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This ESTEEM module in the Ecology Category consists of an Excel workbook that allows the diversity of a biological population to be estimated with both the Shannon and Simpson biodiversity indices based on information theory.

Derivative Matching Game

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.

World Population Growth

This is a module for use in differential or integral calculus. It looks at a differential equation model for world population growth.

Venn Diagrams

This application allows randomized Venn Diagram review and self-testing implemented in Flash.

Truth Table Applet

This straightforward Java applet parses statements from propositional logic and displays their truth tables in a format consistent with most discrete math texts.

Estimating the Area of Virginia

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

WIMS: An Interactive Mathematics Server

An article describing the WWW Interactive Mathematics Server (WIMS), designed for supporting intensive mathematics work via the Internet with server-side interactivity.

Chemical Graph Theory

Chemical Graph theory is used to model physical properties of molecules called alkanes. Java applets allow for interactive exploration of molecules. A student project and discussion of its application are included, along with spreadsheets of model data.

Parametric Curves in 3D

This applet uses the free Flash player plug-in resident in most browsers to allow the user to plot a parametrically defined curve on a customized scale and dynamically rotate the three-dimensional picture.

Interactive Gallery of Quadric Surfaces

A suite of mathlets for interactive exploration of quadric surfaces