 Staying in Step  Ivars Peterson (MathTrek)
Christiaan Huygens noticed that the pendulums of the two suspended clocks, hanging side by side from a common support, were swinging together. When one pendulum swung to the left, the other went to the right. The pendulums remained precisely in opposite
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 Stayorswitch.com  Jeremy Jones
Game simulation and animated explanation videos of the Monty Hall problem. A blog by Jones, who teaches high school math, dates back to February, 2014, with other probability puzzles.
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 Stealing Copernicus  Keith Devlin (Devlin's Angle)
The theft of a first edition copy of Nicolaus Copernicus's classic text De revolutionibus orbium coelestium ("On the revolution of the heavenly spheres") was the seventh such disappearance of this valuable work in recent years  a chain of thefts that
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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 Loops (Catalogue of Algebraic Systems)  John Pedersen, W. Edwin Clark; Dept. of Mathematics, University of South Florida
Definition, examples, and references about Steiner and TS Loops, and links to related terms in the Catalogue.
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 Steiner Quasigroups (Catalogue of Algebraic Systems)  John Pedersen, W. Edwin Clark; Dept. of Mathematics, University of South Florida
Definition, examples, and references about Steiner Quasigroups. Links to related terms in the Catalogue.
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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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 Stella: Polyhedron Navigator  Robert Webb
"Small Stella" is a program for viewing polyhedra and printing their nets so you can build your own. It has over 150 builtin models, plus their duals. Models include Platonic solids, Archimedean, KeplerPoinsot, Johnson solids, "Near Misses," and Stewart
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 Stella's Stunners  Rudd Crawford
More than 600 nonroutine mathematics problems named in honor of the Dutch baroness Ecaterina Elizabeth van Heemsvloet tot Schattenberg. Each collection in the Stella Library contains five subsets, one for each course of PreAlgebra, Algebra I, Geometry,
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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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 The STEM Collaborative  Maryland Public Television, Arkansas Educational Television Network, Alabama Public Television, and Kentucky Educational Television
The four online adventures Scale City, ProportionLand, Math by Design (architecture), and Rock 'n Roll Road Trip (music) engage students to use geometry, algebra, and proportional reasoning for skateboard ramps, cooking, amusement park roller coasters
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 STEM Concept Videos  Teaching and Learning Laboratory, Massachusetts Institute of Technology
Concept "vignettes" for first and secondyear undergraduate engineering students to watch: conservation of mass, latent heat, electric potential, flux and Gauss' Law, motion, contaminant fate modeling, curl, divergence, enzyme kinetics, gradient, equilibrium
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 STEM On Mobile
Makers of educational apps for iPad and Android tablets such as Geometry Pad and Constructions Tutor. Watch demo videos, read the developers' blog, and more.
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 The STEM Project: Six through Eight Mathematics  Rick Billstein, University of MontanaMissoula
A mathematics project that developed a national curriculum to be used by all students, with a complete set of student, teacher, and assessment materials. The materials were developed over a 60month period and have been published under the title MathThematics
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 STEM: Science, Technology, Engineering, Mathematics  Center on Instruction at RMC Research Corporation
Webinars and other resources for mathematics instruction and assessment: research metaanalyses and summaries, practitioner guides, tools, examples from the field, standards and assessments, and professional development modules, training materials, and
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 STEM Sheets
Makers of printable flash cards. Choose number ranges, and whether or not to include answers, before freely downloading PDFs of addition, subtraction, multiplication, or division problems.
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 STEM Transitions  Center for Occupational Research and Development (CORD)
STEM Transitions offers more than 60 integrated projects for use in math, science, and technical courses in the six STEMrelated clusters: health science; information technology; manufacturing; transportation; science, technology, engineering and mathematics;
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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's Guide to Logical Fallacies  Stephen Downes
Lists all known logical fallacies, with definitions, examples, and the steps needed to prove that the fallacy is committed. Site also includes links to logic references and resources.
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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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 Step into 2nd Grade  Amy Lemons
Blog by a second grade teacher in Texas who sells her original classroom materials on Teachers Pay Teachers. Dating back to May, 2011, her posts routinely feature snapshots of her colorful, cheerful supplies. Lemons' math posts have included "Addition
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 STEPS Online Tutoring  TCYonline.com
TCYonline.com provides oneonone live online math tutoring and homework help for grade K12 students. The service offers test prep for the SAT, ACT, GRE and GMAT and State Level exams 24x7, round the year. TCY also provides math education consulting
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 Stereograms: A COOL Application of Geometry  David Eger
Images that look like TV static, but if you look at them in a certain way, 3D pictures "pop out" at you. Download StereoGrinder (a Java program) to create stereograms; to see them do not look at the paper or screen on which the stereogram lies, but beyond
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 Stereographic Projection (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Let G be a sphere in Euclidean three space. We want to obtain a picture of the sphere on a flat piece of paper or a plane. Whenever one projects a higher dimensional object onto a lower dimensional object, some type of distortion must occur. There are
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 Steve Fulling's Home Page  Stephen A. Fulling
Courses in Foundation Coalition Freshman Calculus, linearity, and other subjects offer objectives, assignments, solutions and reports, exams, and supporting documentation such as books (.pdf, .ps, and .dvi formats). The site also includes access to the
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 Steve Leinwand
Publications, presentations, blog, and more by a Principal Research Analyst at American Institutes for Research (AIR). Freely download articles such as "Moving Mathematics Out of Mediocrity," "High Leverage Mathematics Instruction Practices," "Making
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 Steve Mayer's Web Pages  Steve Mayer
Intended for Mayer's students at Bournemouth & Poole College: syllabi, student web pages, assignments, homework, module notes, review material for the A Level Pure Mathematics curriculum, and more, including resources for the Norwegian students he
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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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 Steve's Math Resources  Steve Mills; LewisClark State College
Course notes, worked problems, and practice exams for courses offered by Steve Mills in differential equations, basic calculus, probability and statistics, and college algebra.
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 Steve's Math Site
"Mathematic memorabilia" by a Phoenix, Arizona high school student: binary numbers, factorials, calculations of 2^x from x=1 to x=200+, hand calculations of pi, logarithms and one radian, 3^x from x=1 to x=100+, and more.
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 Steve's Words  Steve Lee
Mathematicsrelated articles by a student at UCLA include brief reviews of books on chaos theory and an article on the connection between game theory and nuclear strategy.
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 STFMath  Slavko Ilic
STFMath (was SunCalculator) is a multipurpose math utility: draw, analyze and evaluate Cartesian, Parametric and Polar functions, manage matrixes, complex
numbers, geometry and more.
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 Stickets  Wanderlands
A puzzle game for iPhone "that forgot Tetris existed": drag tricolored Lshaped blocks onto a grid and tap contiguous, similarly colored areas comprised of three or more squares in an ongoing quest to preserve space on the grid. The app also challenges
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 Still Soft.com  Molchanov Denis & Belluyan Minas, Still Soft.com
Graphing calculator software for Windows, designed to be easy to use. Find asymptotes of functions, break points and extremums, calculate limits, define integrals, find derivative of functions and more.
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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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 The STIMULUS Project  Department of Applied Mathematics and Theoretical Physics, University of Cambridge
STIMULUS gives Cambridge University students the opportunity to assist experienced teachers in local schools, where they help weekly in mathematics, science, computing, information technology, design technology, and personal, social & health education
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 The Stirling EngineRefrigerator: Rich Pedagogy from Applied Physics  Randall D. Peters
An article detailing experiments with a Stirling engine. Abstract: A Stirling engine of the type used for demonstration purposes has been outfitted with a pair of sensors that measure pressure and piston displacement when the engine is operating with
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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 Analysis  Vincent Delloume
Links to sites related to financial mathematics: Introduction to stochastic analysis applied to finance, option pricing and risk management.
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 Stochastic Calculus Notes  Alan Bain
A complete elementary introduction to stochastic integration with respect to continuous semimartingales. Download in postscript, DVI, or PDF format.
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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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 StockGarden  Robert Russell
Stocks and investing. Valuations and rankings of the best companies listed on the NASDAQ and NYSE.
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