 Some Planar Isospectral Domains  Buser, Conway, Doyle, Semmler
A paper on isospectral pairs of plane domains, and a particularly simple method of proving isospectrality. One example is a pair of domains that are not only isospectral but homophonic, showing that one really can't hear the shape of a drum. With a gallery
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 Some Problems in Matroid Theory  Thomas Zaslavsky
Sources of problems compiled by Zaslavsky, and problems he's found interesting: Bonin's Projective Bound; Maximum rFlat; Covering And Packing by Flats. For general sources of information on matroid theory, see Matroid Miscellany.
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 Some (Unsolved) Mathematical Problems  Jörg Winkelmann
A collection of some analysis questions the author encountered in the context of his own research.
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 Sommer Cube  Michael Sommer
The faces of the modular Sommer Cube (S3) feed into twisted conduits that comprise a threedimensional, tunnelling maze. The website provides example arrangements and construction questions such as "Given that a ball must exit at the lowest S3 level and
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 sortedsums  D. J. Bernstein
A collection of tools for enumerating small solutions to certain types of Diophantine equations. Includes links to the latest published sortedsums package, and to a paper explaining the algorithms used.
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 Sources in the history of algebra: arithmetical and recreational problems  Albrecht Heeffer
A comprehensive database of arithmetical and algebraical problems from sources before the 18th century, for research and educational use.
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 Southeast Applied Analysis Center (SAAC)  School of Mathematics, Georgia Tech
A centralized location to coordinate activities in applied analysis in the
Southeastern United States, fostering academic research, applied mathematical research in industrial settings, and educational innovations. The present departmental strengths
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 The Southwest Center for Arithmetic Geometry  Romyar Sharifi, Principal Investigator
In this intensive fivedaylong school, advanced graduate students work closely with senior faculty and postdoctoral fellows — not as individual researchers presenting their work in relative isolation, but in highly participatory, extended courses
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 Southwest Journal of Pure and Applied Mathematics  Ioannis Argyros, EditorinChief
The Southwest Journal of Pure and Applied Mathematics (SWJPAM) is an electronic journal devoted to all aspects of pure and applied mathematics, and related topics. Electronic issues date back to 1995, and are available for download in postscript, compressed
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 SpaceFilling Designs  Edwin van Dam, Dick den Hertog, Bart Husslage, Gijs Rennen; Tilburg University, the Netherlands
Free online database of spacefilling designs for (computer) experiments. Includes maximin, nested maximin, and minimax designs, as well as a bibliography and links to other web sites. All designs on this website may be downloaded and used free of charge,
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 Space Science and Engineering Center (SSEC) Visualization Project  Bill Hibbard
The SSEC Visualization Project makes the Vis5D and VisAD systems freely available over the Internet. Vis5D provides interactive visualization of the output of numerical simulations of the Earth's atmosphere and oceans. VisAD enables scientists to interactively
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 Special Functions  D. Lozier; Applied and Computational Math Division, NIST
This area of numerical computation has the property that input to its software is of small dimension, so highaccuracy reference software that produces test data with guaranteed error bounds is feasible. Library developers need illustrations of anomalous
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 Special Functions in WolframAlpha  Michael Trott
Special functions describe a large number of phenomena in mathematical physics and other disciplines. Michael Trott posts here about WolframAlpha's treatment of these functions. In particular, there are some with two forms: a simpler version that makes
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 Special Interest Groups: American Educational Research Association (AERA)  College of Education, Arizona State University
Index and complete list of AERA SIGs, which provide a forum within AERA for the involvement of individuals drawn together by a common interest in a field of study, teaching, or research when the existing divisional structure may not directly facilitate
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 Spirals (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on spirals of all kinds.
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 splib/wavelets  Rice University
Rice Digital Signal Processing (DSP) wavelet resources: links to wavelet research groups around the world.
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 SPLUS: Statistics and Data Mining Software  TIBCO Software Inc,
A suite of software products based on the "S" programming language created specifically for data visualization and exploration, statistical modeling and programming with data. It provides an objectoriented environment designed for interactive data discovery
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 Spreading the Word  Keith Devlin (Devlin's Angle)
History of and commentary on early calculus texts. "The first calculus text hit the shelves in 1696. They have been growing steadily in size (if not mathematical content) ever since. That first genresetting volume was Guillaume Francois Antoine de l'Hospital's
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 The Springer GTM Test  David Savitt
Multiple choice questions that promise to identify "which SpringerVerlag graduate text in mathematics you are."
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 Springer Science Online  SpringerVerlag New York Inc.
SpringerVerlag (offices in New York, Barcelona, Berlin, Heidelberg, Hong Kong, London, Paris, Tokyo, and Vienna) has over 10,000 books in print, with 280 journals and magazines produced each year and over 1,500 new titles released annually to cover the
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 SP Spectral Theory (Front for the Mathematics ArXiv)  Univ. of California, Davis
Spectral Theory preprints, from the U.C. Davis front end for the xxx.lanl.gov ePrint archive, a major site for mathematics preprints that has incorporated many formerly independent specialist archives. Search by keyword or browse by topic.
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 Square Cell  Brian Prentice
Three 2D Cellular Automata explorers for Windows.
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 Stan's Library  Stanislav Sykora
A library including a section of mathematical articles, reviews, etc..
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 Stardust Equations  Keith Devlin (Devlin's Angle)
On Sunday, February 7, at 4:04 PM, a Lockheed Martin Delta II rocket lifted off from Cape Canaveral carrying an unmanned spacecraft about the size of an office desk, having the romantic name of Stardust. If all goes well, on January 15, 2006, the spacecraft
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 StatiBot  Dominik Heeb
This interactive expert system for solving statistical problems inferentially guides users through data to the proper test method step by step. Also available in German.
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 Statiscope  Mikael Bonnier
Statiscope presents summarizing data and descriptive statistical charts. In the applet you can enter data manually or download data over the Internet. Charts included: Distribution, Probability mass, Density, Box plot, Stem & leaf; also other features
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 The Statistical and Applied Mathematical Sciences Institute (SAMSI)
A "formulator and stimulator of research," the Statistical and Applied Mathematical Sciences Institute (SAMSI) seeks to synthesize the statistical sciences and the applied mathematical sciences with disciplinary science to confront data and modeldriven
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 Statistical Reference Datasets  Applied and Computational Math Division, NIST
A project designed to improve the accuracy of statistical software by providing reference datasets with certified computational results that enable the objective evaluation of statistical software. Dataset archives (Analysis of Variance, Linear Regression,
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 Statistics Education Research Journal (SERJ)
SERJ is published jointly by the International Association for Statistical Education and the International Statistical Institute to encourage research activity, and to advance knowledge about student's attitudes, conceptions, and difficulties as regards
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 Statistics Norway
The agency that collects Norwegian statistics. Includes articles about data, tables of recent economic and population statistics, and list of publications; many publications and research papers may be read or downloaded in PDF format. The site also
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 Statistics (WWW Virtual Library)  Dept. of Statistics, University of Florida
Web information systems relating to Statistics. Data sources; job announcements; links to departments, divisions, and schools of statistics (Australia, Brazil, Canada, Europe, Israel, Mexico, New Zealand, United Kingdom, United States); statistical research
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 StatLib  Dept. of Statistics, Carnegie Mellon University (CMU)
A system for distributing statistical software, datasets, and information by electronic mail, FTP, gopher, and WWW. Quick summary of contents, longer annotations.
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 StatLibJASA Data Archive  Mike Meyer
Contributed datasets from articles published in the Journal of the American Statistical Association. Examples include data from articles such as: "The Chilean Plebiscite: Projections Without Historic Data"; "Kriging and Splines: An Empirical Comparison
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 Stef's HTML Equation Generator  Stefan Waner
A utility that generates math symbols and equations for web pages. The Equation Generator also allows editing of the HTML output. No plugins necessary; no need to create gifs for entire equations. Download Mac or PC versions; or use an online Javascript
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 Steiner Surfaces  Adam Coffman
Equations and graphics of Steiner surfaces: algebraic varieties with quadratic rational parametrizations. The classification includes quartic models of the projective plane, ruled cubics, and quadric surfaces. Steiner surface patches can be used in computer
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 The Steiner Tree Page  Joe Ganley
The Steiner tree problem is a minimum interconnection problem. The most basic
version is in a graph: given a weighted graph in which a subset of vertices are identified as terminals, find a minimumweight connected subgraph that includes all the terminals.
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 stella2java  Shodor Education Foundation, Inc.
Use Stella2java to make Java applets out of the modeling software package Systems Thinking Experimental Learning Laboratory with Animation (STELLA). Copy and paste your equations from Stella into a web form, answer a few questions, and download your applet.
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 STELLA  isee systems
A model building and simulation software package. Read about STELLAbased materials such as Lessons in Mathematics: A Dynamic Approach. Get help with STELLA training, seek live support building a model, see tutorials, purchase supporting books and videos,
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 Stellated Icosahedra  Roman Maeder
An excerpt of an article published in Mathematica in Education. There are 59 stellations of the icosahedron; these pages contain various images of them, ordered by increasing circumradius, and some background information. The metric properties and graphics
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 Stephan Kaufmann
A site with information about Stephan Kaufmann's Mathematica books, notebooks and packages, including A Crash Course in Mathematica.
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 Stephen P. Booth
A researcher working in physics and parallel computing. Articles and source  code for random number generation (parallel generation and a generic Fortran90 interface), and the xmountains program, which uses fractals to generate computer images of landscape.
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 Stephen Wolfram
The creator of Mathematica and one of the first researchers into cellular automata. Site includes a biographical sketch, photos, and a timeline of Wolfram's life; interviews with him; and the full text of many of his books, articles, talks, and patents.
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 Steven M. Christensen and Associates, Inc.  Steven M. Christensen and Associates, Inc.
Offers scientific computing consulting and program development for corporations and universities. Also distributes Schur, a group theory software for handling calculations with Lie and symmetric groups; and Sunfreeware.com, the Solaris Freeware Project.
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 Steven Strogatz
Research, teaching, publications and more by Strogatz, Jacob Gould Schurman Professor of Applied Mathematics at Cornell University. Best known in the academia for his 1998 Nature paper on "smallworld" networks, which he coauthored with his former student
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 Steven Strogatz  The New York Times Company
Mathematics from an adult perspective  from the basics of math to the baffling  by Steven Strogatz, a professor of applied mathematics at Cornell University. This New York Times series is not meant to be remedial, but rather to give readers a better
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 STIMATH  Software Techniques Inc.
An expression evaluation tool that generates plots from any programming environment  even a command line.
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 Stochastic Analysis Digest  Carmona & Durrett, Moderators; Princeton University
Stochastic Analysis Digest provides conference information and publication
announcements in the areas of probability, stochastic analysis, statistics and
related fields. It has a section on open positions and is considering adding an
open discussion
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 Stochastic Differential Equation Software  Yin Mei Wong
Commercial software for numerical solution of stochastic differential equations, for Windows, Linux, and Unix machines.
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 Stochastic Lab  Denis Kozyr
Shareware and freeware math tools include the Smart Monte Carlo Excel addin, the thirteen functions of which generate random numbers with a certain distribution using the Monte Carlo method; Archim, which graphs functions based on explicit parametric
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 Stochastic Programming FTP Archive  Cambridge University
The Judge Institute: Research: Working papers and resources: Finance: FTP Archive. A set of WATSON pension fund management test problems, with random coefficients generated according to two different procedures  independent scenario generation and conditional
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