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Generalized Baseball Curves: Three Symmetries and You're In!

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.

Parametric Surfaces in Cylindrical Coordinates
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.
The Linear Algebra Behind Search Engines
An extended module for students to explore the linear algebra concepts, especially the singular value decomposition, behind modern search engines
Let's Do It!
A Developer's Area column on Java for those coming from a teaching background who seek programming advice and those with a software development background who seek to develop an item of value to the teaching and learning communities.
How to Submit an Article to Loci
A brief outline of policies for submission of articles to Loci.
Two-Species Model
A Biological ESTEEM module in the Ecology Category. This worksheet simulates the population growth of two interacting species.
Writing Mathlets II: A Call to Math Professionals
This is the second in a series of Developers' Area articles on writing Java applets.
Trisecting a Line Segment (With World Record Efficiency!)

This article looks at several geometric, straightedge-and-compass constructions for trisecting a line segment, comparing them based on the numbers of lines or circles required for the construction.

Linear Algebra Toolkit
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.
Experiments with Matrices and Vectors in Calculus and Linear Algebra
This paper describes a Flash-based OSSLET that we have used at the United States Military Academy with first year calculus students as a vehicle for motivating vectors, matrices, and linear and affine transformations.

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