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Matrix Market - A visual repository of test data for use in comparative studies of algorithms for numerical linear algebra, featuring nearly 500 sparse matrices from a variety of applications, as well as matrix generation tools and services. Algebra Problem of the Week - A weekly interactive project for algebra on the Internet. Challenging problems are posted and solutions appear on the Web. Introduction to the system of math discovered by Jakov Trachtenberg. Basic formulae are presented along with background and proofs.