 Symmetry and Group Theory (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
Computational and recreational geometry pointers to sites with information, problems, and lessons having to do with symmetry and group theory (tessellations, kaleidoscopes, origami, etc.).
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 Symmetry and Orbifolds (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
Given a symmetric pattern, what happens when you identify equivalent points? You get an object with interesting topological and geometrical properties, called an orbifold... hearts, paper dolls, wave patterns, quotient orbifolds, Moebius bands.
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 Symmetry and Pattern: The Art of Oriental Carpets  The Textile Museum/Math Forum
In this online exhibit, the study of symmetry is used to analyze patterns in Oriental carpets. A joint project of The Textile Museum and The Math Forum.
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 Symmetry  Rick Engel
A lesson on the symmetry of the Platonic and Archimedean solids using Polymorf, a math manipulative product. Demonstrates inscription, truncation, sectioning, and space filling with polyhedra.
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 Symmetry Studio 1.01  Binkley, Simon; Artware, Inc.
Symmetry software for mathematics and art, for the Macintosh. A computeraided design tool that allows you to quickly create complex twodimensional symmetrical patterns. It simplifies the study and use of mathematical principles that underlie the regular
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 SysQuake  Calerga
Highly interactive software for the design and simulation of dynamic systems. Runs on PowerPC Macintosh computers and Windows 95, 98 and NT 4 computers. SysQuake LE is the free version of SysQuake, and may be downloaded from the site.
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 SysteMATHics  Sigurd Andersen
Based on a discipline started by John G. Bennett, systematics is an attempt to understand the meaning implicit in number. The three areas of mathematical exploration covered are triadic numbers; ngrams, number patterns expressed graphically using the
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 System Dynamics in Education Project (SDEP)
System dynamics is a method for studying the world around us. It deals with understanding how complex systems change over time. Internal feedback loops within the structure of the system influence the entire system behavior. Math materials are available
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 System Dynamics  Maryland Virtual High School at Montgomery Blair High School
Understanding how complex systems change over time: internal feedback loops within the structure of the system influence the entire system behavior. Tools and resources including connections to other system dynamics/operations research projects; and links
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 Systemic Initiative for Montana Mathematics and Science (SIMMS)
A fiveyear, cooperative initiative of the state of Montana and the National
Science Foundation, with nine major objectives, including the redesign of the
912 mathematics curriculum using an integrated, interdisciplinary approach for all students,
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 syzygymatrix: solutions for small problems in the classroom  Jeff LeMieux
Generate cryptograms, division worksheets, fraction worksheets, and proportion problems. Select the length of dividend, denominators specified by the Washington State Standards for Grade 7, number of problems, and more. The worksheet maker prints solutions.
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 Syzygy Shareware  Thomas C. Bretl
A source of math freeware for both Mac and PC, appropriate for grades K12. Includes games,
simulations, and skillbuilding programs. Explore, see in new ways, discover patterns, and solve
problems.
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 T^{3} Conferences  Texas Instruments, Inc.
The T³ program hosts the annual T³ International Conference each spring and twoday Regional Conferences throughout the year. T³ Virtual Conferences contain video recorded sessions from T³ events. T³ conferences are appropriate for Kcollege, mathematics
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 Table of numbers problem  Dario Alpern
Place the natural numbers between 1 and mn in a table of m rows by n columns, so that the sum of the addition of the products of the numbers that compose the rows plus the addition of the products of the numbers that compose the columns is as low as possible.
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 Tables of Roman Measurement  Mike Neill
Tables of Roman measurement on this site (Calender, Capacity, Length, Money, Surface, Weight) are taken from A Smaller LatinEnglish Dictionary, by William Smith LLD, a Classical Examiner in the University of London, John Murray, Albemarle Street, 1865.
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 Take a Little Piece of PI with You Wherever You Go  Adam Zampino
Proudly display PI to 1000 decimal places in an attractive design, in various types of apparel and housewares (mugs, clocks, etc.). PI has fascinated people for centuries, and now you can have your own piece of PI to enjoy. This makes a great gift for
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 Taking 20 Percent Off  NASA Lewis Learning Technologies Project
If a $900 computer is on sale for 20 percent off, what is the sale price? A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Taking America's Measure  National Institute of Standards and Technology (NIST)
Resources on this site for children include: Metric Pyramid (a pattern that can be printed, cut out, folded, and taped in the shape of a pyramid); Metric Fast Facts for Sports; Metric in the Kitchen; All You Will Need to Know About Metric; Metric Conversion
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 Taking a Workshop or Course  Annenberg Media
Workshops and courses appropriate for preservice and inservice teachers, administrators, reformers, and policymakers. Supplemental video programs called teaching practices libraries are also availablethey give a "flyonthewall" view of real teachers
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 Taking Games Seriously  Cut the Knot!, Alexander Bogomolny
In the twenty years since it first appeared, Winning Ways for Your Mathematical Plays had become a classic and a rarity. So did its companion book, On Numbers And Games, which was written in just about a week by one of the WW's authors and saw the light
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 Talking Math Ed with the Males  Josh and Lorraine Males
This blog "dedicated to all things math ed" includes lesson ideas, policies, curriculum, and research. Posts "for people to have a conversation about mathematics education," which date back to August, 2011, have included "CCSS from the Curriculum Writers
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 Talk of the Nation, Science Friday  Ira Flatow, National Public Radio
An edited version of a radio program that aired on September 9, 1994. Science Friday host, Ira Flatow, interviewed guests Keith Devlin, Dean of Science at St. Mary's College, and William Dunham, math professor at Muhlenberg College.
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 Tangencies of Circles and of Spheres: Radii Solutions  Eugene F. Dearing; Dearing Aviation
New methods of finding the radii of circles tangent to three given circles, (Apollonius' Problem), and the radii of spheres tangent to four given spheres, (Apollonius' Problem in three dimensions). Download the article in zipped format, or view it online.
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 Tangent Circles  Paul Kunkel
Three circles are given. How many circles can be constructed tangent to all three? How are they constructed? This lesson includes ten applets, to cover all of the special cases. Some of them are very complex.
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 Tangoes  Rex Games, Inc.
Based on the ancient Chinese Tangram puzzle, Tangoes is a learning tool that combines artistic and mathematical elements to enhance visual perception ability, develop problem solving skills, and encourage creative thinking capacity and teamwork. Tangoes
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 Tangram Page  S. T. Han
All about tangrams, an ancient Oriental toy that has 7 pieces: 5 triangles in different sizes, 1 square, and 1 parallelogram. The object of the game is to form a given shape using all 7 pieces. Introduction, Puzzle of the Month, PC/Mac Software, Articles
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 Tangrams  J. L. Read; Enchanted Mind
A tangram applet that allows you to rearrange the seven forms to exactly reproduce the given image. To move the pieces, drag them with the mouse. To rotate pieces, click with the right mouse button or (on the Mac with a onebutton mouse) click while holding
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 TaniyamaShimura Conjecture Proved (Math Chat)  Frank Morgan, MAA Online
A proof of the full TaniyamaShimura conjecture, partly included in Wiles's 1994 proof of Fermat's Last Theorem, was announced last week [June, 1999] at a conference in Park City, Utah, by Christophe Breuil, Brian Conrad, Fred Diamond, and Richard Taylor,
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 Tanzzle™  Franco Cocchini
Software for exploring tangrams. View published patterns and/or submit one of your own. Request a free license for schools and educational programs. Free 30day trial; free viewer download. Choose from four different sets of pieces: Tangram (traditional
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 Tareasgratis.com, GetaPlus.com
Ayuda gratuita para las matematicas y las ciencias. Free homework help in math and science for students around the world. A site in English and Spanish (see also http://www.tareasgratis.com/ and http://www.getaplus.com/ or http://www.mystudysite.com/).
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 TareasPlus
Videos de lecciones a frente de una pizarra digital, narrado en español. Variando en duración, los asuntos de matemática incluyen aritmética, álgebra, trigonometría, precálculo, cálculo diferencial,
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 Tarrou's Chalk Talk  Rob Tarrou
Hundreds of instructional videos, most less than thirty minutes long: geometry, matrices, factoring polynomials, trigonometry, precalculus, calculus, AP Statistics, TINspire calculators, and more. Tarrou, who has taught math at St. Petersburg (FL) High
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 A Taste for M&Ms  Ivars Peterson (MathLand)
The package of M&M's chocolate candies (plain) I had just opened contained 56 colorful, little oblate spheroids. It was obvious from a quick glance that certain colors were more common than others in this sample of M&M's. I counted up each color
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 The Tau Manifesto  Michael Hartl
"This manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension... The traditional choice of circle constant is π  but,
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 Taxicab Angles and Trigonometry  Thompson, Dray
Taxicab geometry is essentially the study of an ideal city with all roads
running horizontal or vertical. The roads must be used to get from point A to point B; thus, the normal Euclidean distance function in the plane needs to be modified. Article abstract:
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 Taxicab Geometry/La Géométrie des Taxis  Pascal Tesson
A term project for a Pattern Recognition course given by Godfried Toussaint at McGill University. Other student projects from 1997, 1998 and from a Computational Geometry course are also available. Contents: What is Taxicab Geometry? Why Taxicab Geometry?
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 Taxicab Numbers  Simon Plouffe
A list of the smallest number that can be expressed as a sum of two positive cubes in n different ways, for n = 1 through 5.
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 TcP@d: TeleConferencing Pad  Vision Alpha Products
A small, erasable white board together with a PC camera called a TcP@d (Pat. Pend.), used in conjunction with freely available video conferencing software, to transmit "scribal information" in real time. Viewer(s) see equations, drawings, etc., written
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 TCWORLD: Online Resource for Technology Coordinators
A monthly publication of articles on exceptional uses of technology in schools, software reviews, technology policies, computer setup tips and techniques, security methods, opinions on integration and access, purchasing tips, a newsletter, and more.
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 Teachable Moments International
Nonprofit organization dedicated to inspiring youth to act as "conscious global stewards" through domestic and international academic and cross cultural experiences. Teachable Moments International (TMI) sponsors free math and science workshops for high
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 teachade  AP Ed Ventures
An online community for teachers to discuss issues relevant to teaching, share and author curriculum, access resources that support their professional development, and have an impact on commercial providers of educational services and products. Draft
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 Teach California Charter Schools
A consortium of charter schools and networks throughout California, organized to recruit and select outstanding teachers for positions in the Bay Area, Los Angeles, and the Sacramento and Central Valley areas of California.
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 TeachEngineering Digital Collection
The TeachEngineering digital library provides teachertested, standardsbased engineering content for K12 teachers to use in science and mathematics classrooms. Engineering lessons connect realworld experiences with curricular content already taught
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 Teacher2Teacher  Math Forum
A questionandanswer service for teachers and parents who have questions about teaching math. Staffed by a panel of teaching professionals, Presidential Awardees for Excellence in Mathematics Teaching and Teacher2Teacher Associates, T2T offers an archive
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 Teacher2Teacher (T2T) FAQ  Math Forum
Answers to frequently asked questions from the archives of the Math Forum's question and answer service for teachers, with links to T2T discussions, Ask Dr. Math and the Ask Dr. Math FAQ, and relevant resources on the Web.
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 The Teacher as Facilitator  Classroom Compass
The spring 1994 issue of Classroom Compass, Working for Reform, looks at the idea of teacher as facilitator  a basic part of the reformed classroom. Two classroom activities (one for young children, Mud Slide, the other for later grades, Stream Works)
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 Teacher Education and Professional Development  Mathematics Education at the Math Forum
New ideas and pedagogy: articles, conference sessions, centers, and courses on the Web for preservice education, inservice education, and the college and university level.
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 Teacher Education Materials Project (TEMAT)  Horizon Research, Inc. (HRI)
A site for K12 professional development providers, with a conceptual framework "Designing Effective Professional Development" (short essays on: Understanding the Needs of the Target Audience; Deciding on the Purposes of the Professional Development;
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 Teacher Exchange  the Math Forum
Web units, lessons, and activities organized by NCTM Standards and grade band level. Created by Math Forum staff members, educators, and collaborations between the two. Teachers may contribute their own lessons and ideas as well.
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 A Teacher InService Course on Technology  Carl R. Spitznagel, John Carroll University; The Math Forum
As part of an inservice Master of Arts program for high school mathematics teachers, John Carroll University offers a course titled "Technology in the Teaching of Mathematics." In its most recent offering, this course dealt with the TI82 calculator,
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