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This article discusses parameterized knots (polynomial and trigonometric) and includes an interactive gallery of selected knots and their equations.

This Biological ESTEEM module in the Evolution Category illustrates a number of ESS examples. Each example allows the user to manipulate the initial population for each strategy and the fitness payoffs and costs for each strategy.
This site uses LiveMath (link to the free plugin is included) to allow the user to explore mathematical questions about the equal-arm balance.
A mathlet that allows the user to input a sequence of 0's and 1's of length 20 and then tests the sequence for randomness using three different tests.
An interactive module to study numerical and graphical solutions of differential equations in first-semester calculus.
This article describes classes for 3D graphing revised for AS 3. Along with class files and documentation, we provide several templates to show how to use the classes for graphs of functions of two variables as well as parametrically defined surfaces.
This applet explores the relationship between the cross-sectional area of a gutter (bent from a fixed-width sheet of metal) and the height of the gutter. Supporting material is given for topics ranging from quadratic modeling to max/min problems.

A tribute to one of our authors, who died suddenly and unexpectedly while his second JOMA contribution was in preparation.

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.
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