 Strange Orbits  Ivars Peterson (MathTrek)
Newton's laws provide a precise answer to the problem of determining the motion of two bodies under the influence of gravity. If the solar system consisted of the sun and a single planet, for example, the planet would follow an elliptical orbit. When
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 A Stranger from Spaceland  Ivars Peterson (MathTrek)
An essay about Flatland, Edwin A. Abbott's 1884 "doorway to the fourth dimension and beyond for many explorers of geometry," and "a sharply delineated satire that reflects widely debated social issues in Victorian Britain," particularly women's rights.
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 Strategic Directions in Computational Geometry  Roberto Tamassia, et al.
A 1996 ACM/NSF Working Group Report chaired by Roberto Tamassia, intended to complement the Application Challenges to Computational Geometry. The report outlines the evolution of computational geometry, discusses strategic research directions with emphasis
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 Strategic Directions in Computer Science Education  Allen B. Tucker, Bowdoin College, Editor
From ACM Computing Surveys, 1996. Abstract: This report identifies major issues and challenges in computer science education across a wide range of institutions. It includes suggestions for improving the quality and effectiveness of computer science and
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 StrategicManagementScience.COM  Strategic Management Science, Inc.
Consulting services to help management use management science and operations research to create a sustainable competitive advantage. Publishes the Strategic MS/OR News, a monthly enewsletter that reports on developments in the strategic use of MS/OR.
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 Strategies for Finding Sequences  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about strategies for finding sequences, such as "Write an expression to find the nth term of the following sequence: 3, 9, 18, 30, 45..." and "Find the following 2 terms and a formula for the nth term."
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 Strategy Acquisition and Application (Learning and Mathematics)  Siegler, Jenkins; Math Forum
In this 1989 article, "Strategy Discovery and Strategy Generalization," Robert S. Siegler and Eric Jenkins of CarnegieMellon University discuss how children acquire and apply strategies, looking closely at a small group of students over a long period
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 Strawberry Macaw's Puzzle Page
Although simple, this collection of four logic puzzles provides a challenge for students of any age. The interactive puzzles are: The Fox, the Duck, and the Bag of Corn; The Three Gallon and Five Gallon Cans; The TwentyThree Matches Game; and The Game
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 Street Cents  CBC Halifax, Nova Scotia, Canada
A studentwritten site/TV program on consumer issues and, sometimes, math.
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 Stressed Out: Slope as Rate of Change  Cynthia Lanius
It's the night of the big game. You're in the locker room. The coach is pumping the team up. "Now, I know you people are nervous. That's okay, in fact, that's what we want. You're going to perform better on the court (stage) if you're a little nervous."
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 Strings on Your Fingers  Michael P. Garofalo, Red Bluff, California
Links to a host of Web sites, including Web and print bibliographies, with suggestions for where to learn more about string figures and Internet links.
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 Stroh MathPage  Eric Stroh; Northern High School, Owings, MD
Algebra help for students: explanations, examples, practice problems, and hints for all topics covered in a high school Algebra I and Algebra II course. With pictures from Stroh's class and links to other relevant sites on the Web.
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 Structures Directory  Vaughan Pratt
An email directory of logicians, algebraists, and programming linguists working primarily on structural problems in mathematics and computer science.
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 Stuck on Homework  Royle, Helen; and Watts, Teresa
Sample selftest exam questions and maths video tutorials presented by an experienced maths teacher. Subscribe for full access to hundreds more, as well as a digital whiteboard and other tools.
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 Student Activities from Jefferson Lab's BEAMS Program  Steve Gagnon
Middle school science and math activities from Jefferson Lab. Each activity includes a teacher overview, student and teacher materials which may be viewed online or downloaded in PDF format, and a list of the relevant Virginia State Standards of Learning.
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 Student Calculus Projects  David Arnold; Mathematics Dept., College of the Redwoods, CA
HTML or Scientific Notebook files. Topics: Equiangular Spiral; Semicubic Parabola; Nephroid; Astroid; Witch of Agnesi; Deltoid; Cassinian Oval; Equiangular Spiral; Quadratix; Ellipse; Conchoid of Nicomedes; Archimedes Spiral; Cardiod; Bernoulli's Lemniscate;
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 StudentCreated Calc III Labs  Cervone, Wicklin; The Geometry Center
Five computer calculus labs that explore the application of mathematics to modeling realworld phenomena. Tangent Planes to Surfaces (exploring the tangent planes and gradient vectors of 2 and 3dimensional curves, examining explicit, parametric, and
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 Student Math Projects, Interlochen Arts Academy  Taoufik Nadji, Malek Physix Inc.
Student essays on various math history topics from around the world. The pages are loaded with graphics, animations, and sounds, and (sometimes backgrounds that result in illegible text. Subjects covered include: Early Math Period (Egyptian, Chinese,
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 Student of Hyperspace  Eric Swab
A series of computer generated projections of analogs of the platonic solids in 4space; a projection of a regular polytope that exists only in 4space. Pages: Hypercube analog of the cube with sections and envelopes; Simplex analog of the tetrahedron
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 Student Projects in Differential Equations  David Arnold; Mathematics Dept., College of the Redwoods, CA
PDF or Scientific Notebook files. Topics: Romeo and Juliet; Modeling Molecular Vibrations; Van Meergeren Art Forgeries; The Flight of a Discus; A Simple Microeconomics Model; An RLC Circuit; Autocatalytic Modeling; A Rate of Memorization Model; Tacoma
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 Student Projects in Linear Algebra  David Arnold; Mathematics Dept., College of the Redwoods, CA
PDF or Scientific Notebook files. Topics: Fractal Music; Hill Ciphers; Forest Management  Sustainable Harvesting; The Singular Value Decomposition in Image Compression; Spotted Owl Population; Fourier Series; Arnold's Cat Map; Image Compression with
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 Students' Classroom  National Center for Education Statistics (NCES)
This site for students includes links to Find Your School; College Search; What Are Your Chances?; Create a Graph; Fun Facts; Games & Activities; Mascot Game; Quiz; Glossary; and References. See also Dare to Compare, which presents hundreds of questions
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 Students' difficulties with proof  Annie and John Selden; Mathematical Association of America
Keith Weber overviews research that addresses questions such as "What is proof and what is its role in mathematics?" and "How can the concept of proof be taught effectively?" Difficulties that students have with proofs include inadequate cognitive development,
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 Student's Difficulties with Proof  Keith Weber; Mathematical Association of America
"Proof is a notoriously difficult mathematical concept for students. Empirical studies have shown that many students emerge from prooforiented courses ... unable to construct anything beyond very trivial proofs. Furthermore, most university students
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 Students' Interest for and Work with AppletEnhanced Word Problems  Renninger, Sinclair, Hand, Stohl, Alejandre, and Underwood
Article from the International Conference on Learning Sciences archive, Proceedings of the 6th international conference on Learning sciences. Abstract: Study of student interest for and work with interactive nonroutine mathematics problems (ESCOT Problems
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 Student standouts tackle ills, theorems  P. Weiss  Science News Online
A project by a young mathematician who proved five theorems also garnered highest honors at the 1999 Intel International Science and Engineering Fair.
Jennifer Pelka, 16, of Orlando, Fla., received a $40,000 scholarship for her mathematics project, which
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 Student's T Distribution  Balasubramanian Narasimhan
The t distributions were discovered in 1908 by William S. Gosset, a statistician employed by the Guinness brewing company, which had stipulated that he not publish under his own name. He therefore wrote under the pen name "Student." This page discusses
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 Student Tessellations  Memorial Middle School, Totowa, NJ
Memorial Middle School's Math 7 Class of 2004 completed a tessellation project using the Math Forum's Tessellation Tutorial instructions. The best work was selected for display on the website, with their accompanying poems.
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 Studies In Mathematics: Web Discussion  Breindel, Clair; University of Chicago
The University of Chicago's alternative course to calculus. The first quarter is number theory, and the second quarter is geometry and symmetry. When Bryan Clair taught the courses, he covered the history of number systems, different base number systems
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 Studies in Nonlinear Dynamics and Econometrics  MIT Press, Society for Nonlinear Dynamics and Econometrics
Contents of the journal, 1996present: abstracts and bibliographies are on the Web; full text of articles (PDF format) is available to subscribers.
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 Studio 4 Learning Math  Studio 4 Networks Inc.
Free online videos that explain topics in algebra, basic math, calculus, differential equations, geometry, prealgebra, precalculus, statistics, and trigonometry. Join Studio 4 Learning's Tutor Corps to share videos of your own.
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 studio:ludens  Wouter Walmink and Alexander Rulkens
Free online tools that "let you play with your own creativity," designed by two Dutch industrial and interaction designers in Eindhoven. Create your own patterns with Repper; your own tessellating coasters with Epa:kato; your own fractals and other complex
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 StudyBeat: Math  StudyBeat
Educational video clips on topics in highschool mathematics, including algebra, basic math, calculus, differential equations, geometry, prealgebra, precalculus, statistics, and trigonometry. Subscription required; sample videos available.
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 Study Economics
Online copies of N. Gregory Mankiw's books Principles of Macroeconomics and Principles of Microeconomics and a tutorial by Daniel Christiansen on calculus and economics.
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 Studygeek.org
Lessons, video lessons, formulas, examples, and definitions for learning geometry, algebra, trigonometry, calculus, and statistics.
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 Study Guide for the Advanced Placement Calculus AB Examination  Elaine Cheong
A study guide written to assist students in preparing for the Advanced Placement Calculus AB Exam. Introduction explains the scoring of grades on a scale of 1 to 5. Topics of study include elementary functions, limits, differential calculus, and integral
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 Studying Dimensionality through a StairStep Fractal  Burrill, Frost, Anderson, Burkett, Gribble, Ryerson, & Williams
A background paper and a related classroom activity about a lesson studyproduced activity on using a stairstep fractal to study other dimensions.
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 Studying Mandelbrot Fractals  Suzanne Alejandre
What is a fractal? A definition and a Java applet to help in exploring the Mandelbrot set, redrawing small areas to fill the fractal screen and noticing how the images compare. Also links to other sites with fractal information for middleschoolers.
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 Studying Polyhedra  Suzanne Alejandre
What is a polyhedron? A definition and a Java applet to help in exploring the five regular polyhedra to find how many faces and vertices each has, and what polygons make up the faces. Also links to a page of information about buckyballs, stories written
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 Study Island
Internetbased standardsmastery products, based on state standards. Subscriptions are available for single classes through districts, with individual subscriptions available for GED products.
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 StudyJams!  Scholastic Inc.
An online service that complements the school math and science curriculum for grades 3  6. Aligned with state curriculum standards, StudyJams! takes math and science problems and presents them using relevant, realworld examples students can easily understand.
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 studymaths.co.uk  Jonathan Hall
Free help on your maths questions. See also the bank of autoscoring GCSE maths questions, games, and resources such as revision notes, interactive formulae, and glossary of terms.
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 Study of Mathematically Precocious Youth  Camilla P. Benbow and David Lubinski, codirectors; Peabody College, Vanderbilt University
This 50year longitudinal study of over 5,000 intellectually talented individuals aims to improve understanding of the unique needs of intellectually precocious youth and determine the contrasting developmental trajectories that they display over their
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 Study of Place  TERC
Two online science modules made especially for middleschool students: one about the Shackleton Antarctic exploration, the other about ocean currents. Students will read, experiment, analyze images, and work with maps and graphs. Teachers will find goals
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 StudyPug  Dennis Lee
Homework help and tutoring services for algebra, geometry, precalculus, trigonometry, calculus, and more. Preview some topics, all of which include interactive problems and video of Lee working through exercises.
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 Stuff About Modelling  Lester F. Caudill, Jr., Univ. of Richmond, Virginia
Download a PDF of this informal introductory text for the author's course in Continuous Mathematical Models, including refreshers on single and multivariable calculus, linear algebra, and differential equations.
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 Stupid Calculations  Josh Orter
Repository "where practical facts get rendered into utterly useless ones." Posts, which date back to May, 2013, have included "Monophone," musing on the size of the screen made from ripping the displays out of every iPhone ever sold and combining them
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 SturmLiouville Problems: SLEIGN2  Bailey, Everitt, Zettl, Garbow
A code to compute eigenvalues and eigenfunctions, and to approximate the continuous spectrum of regular and singular SturmLiouville (SL) problems. These problems consist of a second order linear differential equation (py')' + qy = (lambda) w y on (a,b)
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 Style Line: Wheel Trim and Simulators for the 21st Century
Wheel covers to investigate for reflectional and/or rotational symmetry.
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 Suan Pan in Various Number Systems  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of the Chinese Sorobana far eastern analogue of the traditional abacus. By splitting the field into two partsthe earth and the heavenSoroban cleverly reduces the number of items that represent a single digit. The simulation enforces
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