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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.

In Memoriam - Jim White: 1946-2004

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

Special Relativity and Conic Sections

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.

About Loci Resources

Information about the mission of Loci Resources and about submissions and editorial standards.

Biological ESTEEM

Excel Simulations and Tools for Exploratory, Experiential Mathematics (ESTEEM) is a project of the members of the BioQuest Curriculum Consortium.

Group Visualization with Group Explorer

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

Derivative Plotter

A mathlet to sketch a derivative function by hand or by recording slopes of tangent lines.

The Trouble with von Koch Curves Built from \(n\)-gons

by Tamás Keleti and Elliot Paquette

Supplement to article in American Mathematical Monthly

Leslie Matrix for Age-structured Populations

A Biological ESTEEM module from the Ecology Category. This Excel workbook uses the Leslie Matrix Model for population projection of age-class or stage-class structured populations.

The JOMA Developers' Area Wiki

This is a Developers' Area article about the JOMA wiki and about creating and using wikis in general.