 Tesseracts: Cubes Get Hyper (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
Madeleine L'Engle, who wrote A Wrinkle in Time, used tesseract to mean a shortcut through space and time. In her story, spacetime wrinkles, or folds onto itself, creating new paths that allow characters to tesser, or travel from one end of the galaxy
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 Tess  Pedagoguery Software
A shareware program for creating symmetric planar illustrations. With Tess, while you draw you can automatically maintain the symmetry group you have chosen; 11 rosette, all 7 frieze, and all 17 wallpaper groups are included. Illustrations may be printed
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 Test and Worksheet Generators for Math Teachers  Kuta Software
Free printable prealgebra and algebra worksheets in PDF format with answer keys provided; free trials of the worksheet generator software. Purchase online. Windowsbased.
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 Test Banks  Ask Away Ltd.
Data banks of test questions prepared by classroom teachers for use in assorted disciplines in Canada and the U.S., including mathematics grades 7, 8, and 9. Sample questions are available on the site.
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 Test Dates  Graduate Educational Information Service
Dates and practice questions for major standardized tests, including the ACT exam, SAT test, Graduate Record Examination (GRE), and employment tests such as the Massachusetts Tests for Education Licensure (MTEL), the New York State Teacher Certification
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 Testing and Measurement: Articles and Research  Carolyn K., Hoagies' Gifted Education Page
Articles and reports on assessment and measurement, and also underachievement, in the context of the education of gifted children.
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 Testing Applets  Philippe B. Laval, Kennesaw State University
Applets categorized into regression, linear functions, quadratic functions, exponential functions, trigonometric functions, differentiation, integration, and graphing and other applets.
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 Testing Subsets Using Prime Numbers  Ian Clarke
Algorithm for subset testing which assigns a prime number to each element of the set and multiplies the primes. With descriptions of and comparisons to two other algorithms.
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 TestPrep Mathematics Table of Contents  Pamela Cohen, Walter Antoniotti
Free practice problems worksheets in whole numbers; fractions; decimals, ratios, rates, proportions, and percentages; exponents, roots, algebra, and geometry; using formulas to solve problems; multistep word problems; and graphs, signed numbers, statistics,
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 Test Prep Review  Testprepreview.com
As the title of this site indicates, there are materials to help users review in preparation to take a variety of tests, including the GRE, SAT, ACT, and Praxis. Under each of the free practice test areas, there are selfassessment modules with a set
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 Test Professor.com  Test Professor, Inc.
Test Professor offers online diagnostic tests, student assessments, tutorials, math help, testprep, and practice tests. Choose a country, province, or state to see its standards, objectives, targets, skills, department of education, and example problems
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 TestTubeGames  Andy Hall
Apps, Flash games, and simulations by "an escaped physics grad turned educator.... following his dream to make abstract physics concrete. And draw dinosaurs." Explore special relativity with Velocity Raptor, orbits and chaos with Gravity Sim, particle
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 Tetrakys
Interlooping equilateral, isosceles, and scalene triangles for building two and threedimensional geometric objects, exploring area and volume, and visualizing fractions and arithmetic operations. The foam composition of these colorful manipulatives
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 Tewodros Amdeberhan's Electronic Headquarters
Tewodros Amdeberhan studies combinatorics, number theory, special functions, partial differential equations, computer algebra, algorithmic proof theory, and harmonic analysis. His articles on these topics, as well as some unpublished musings, are available
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 TeX2HTML  Curtis, Housken; WebPrimitives
A conversion utility that translates .tex files into .html files without converting typeset mathematics to GIFs. TeX2HTML converts typeset mathematics into HTMLbased layout commands, calling on the SYMBOL font resident on all computers, to provide for
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 TeXaide  Design Science, Inc.
A free version of MathType's Equation Editor for Windows 95, 98, and NT that generates TeX using MathType 4's TeX translator technology. Whereas Equation Editor can be used with any application that supports OLE or can paste a graphic from the clipboard,
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 Texas Instruments Syllabus Support Offer  Texas Instruments, Inc. (TI)
Texas Instruments wants to add greater impact to your curriculum and lessons. Let them know in what courses you are using TI technology, and they will send you support materials to help integrate it into your classroom: a TINspire™ support packet, TI
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 TeX, METAFONT, dvips, and Related Files  Stanford University
The files in subdirectories "dist" and "local" of this directory are master files for TeX and METAFONT, maintained personally by Donald E. Knuth. The dist/ directory contains the latest official sources for TeX, METAFONT, Computer Modern, and accompanying
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 Textbooks: Download Free Ebooks  Bookboon.com
Free ebooks for download, with advertisements approximately every third page. Site defaults to US or UK options; look for Calculus or Mathematics in the left sidebar for mathrelevant topics.
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 texthelp  Texthelp Ltd.
"Making math digital" with g(Math) and its successor, EquatIO, a browser extension that takes math from keystrokes, handwriting, or dictation, and typesets it into Google Docs with a click of a button.
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 T_{E}X THE WORLD  Avital Oliver
This addon to the FireFox browser takes TeX typesetting on any website and renders it as an image. TEX THE WORLD runs every 3 seconds on interactive websites, so it marks up chat sessions as well as HTMLenabled webmail, embedding symbols on the fly
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 TeX to GIF converter for Web documents  John Walker
A simple Perl program that uses the same software tools as are employed by LaTeX2HTML to compile individual equations in short LaTeX files into GIF images suitable for embedding in Web documents.
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 Texture and Colour  Paul Bourke
In many texturing applications it is necessary to be able to "tile" the texture over a larger region than the texture segment covers. Bourke offers a discussion with examples of tiling formats, together with links to tiles: Tile; Brick, Tile; Stone tile;
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 TeX Users Group (TUG)
Founded in 1980 to provide leadership for users of TeX, Donald Knuth's revolutionary typesetting system, TUG represents the interests of TeX users worldwide. From this site you can find activities (calendar, TUGboat, TUG meetings, user groups, working
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 Thales' triangles  Joshua Bowman
Blog about "teaching and doing mathematics at a liberal arts college." Posts by this Smith College professor date back to July, 2006: "instability and control"; "the end of a good man's life" (on the death of mathematician Adrien Douady); "Klein's quartic
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 That Math Lady  Mandy Casto
Blog posts, which date back to August, 2012, have included "A Smartphone Becomes a Teacher's Best Friend," "Math Misconceptions Malady," "Circle Math Foldable," "Using Comics to Communicate," and "How: The Most Important Question in Math." See the library
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 ThatQuiz  Andrew Lyczak
Practice integer and fraction arithmetic, inequalities, averages, exponents, factors, algebra, calculus, shapes, probability, place value, graphs, sets, trigonometry, and more. The site times and scores performance. Register for online administration
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 That's Mathematics!  Nate Eldredge
A mathematician's collection of "various sparetime projects." Blog posts of "diversions, distractions, and math," which date back to June, 2012, focus on Mathgen, Eldredge's perl program that uses contextfree grammar, LaTeX, and BibTeX to randomly generate
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 Theatrix (SWMC)
Sanctuary Woods Multimedia Corporation has joined with Theatrix Interactive to provide educational digital media experiences for kids. Currently offers Shockwave games, CDRom educational programs, and contests. CDRoms work with both Windows and Macs;
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 TheBestSoftware.com
Free trial version of a shareware scientific calculator, with a "printed" tape that you can edit.
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 TheGeometryTeacher  Andrew Shauver
Shauver, who teaches at a Michigan public high school in a onetoone laptop program, blogs to "describe his own independent learning and to reinspire the natural curiosity sometimes absent from the typical high school classroom." Posts, which date back
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 T.H.E. Journal Educational Technology Conferences  T.H.E. Journal
Search and browse educational technology conferences based on location, target audience, attendees by job responsibility, and conference size. Also link directly to the conference site and send email to the conference managers.
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 themathlab.com
Playful, interactive studentmade problems, games, drills, lesson ideas, tools, "magic," and more. Lessons include practice problems which, when solved correctly, generate passwords that grant access to "treasure rooms." Lesson ideas include Algebachee
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 TheMathPage: An Approach to Calculus  Lawrence Spector; Borough of Manhattan Community College, CUNY
An introduction to real numbers, including such topics as: continuous versus discrete; limits; continuous functions; the "limit" infinity (?); the derivative; the chain rule; velocity and rates of change; maximum and minimum values; derivatives of trigonometric
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 TheMathPage: Plane Geometry  Lawrence Spector; Borough of Manhattan Community College, CUNY
A complete course based on Book I of Euclid's Elements, culminating in the Pythagorean theorem. Includes questions for checking understanding, with solutions.
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 TheMathPage: Skill in Arithmetic  Lawrence Spector; Borough of Manhattan Community College, CUNY
A complete course in arithmetic: reading and writing whole numbers and decimals; addition, subtraction, multiplication, and division. Features the verbal, nonalgebraic theory of ratio and proportion, leading to fractions and percent. The usual written
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 TheMathPage: Topics in Precalculus  Lawrence Spector; Borough of Manhattan Community College, CUNY
Topics in precalculus include the formal rules of algebra; rational and irrational numbers; functions and functional notation; graphs; the vocabulary and roots (zeros) of polynomial functions; completing the square; the factor theorem and integer root
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 TheMathPage: Topics in Trigonometry  Lawrence Spector; Borough of Manhattan Community College, CUNY
Trigonometry from the very beginning, for anyone who needs help or a review of trigonometry. Topics include: Ratio and Proportion; Radicals: Rational and Irrational Numbers; The Pythagorean Theorem; The Definitions of the Trigonometric Functions (Ratios);
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 themathprof.com
In this cyber classroom, using animated, talking characters, Prof. Martin Weissman and his student discuss topics in Algebra. Includes a practice problem session. Internet Explorer and other software downloads required.
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 TheMathWebSite.com: aMath Teacher's Best Friend  TheMathWebSite.com
Provides high school math lesson examples, quizzes and tests complete with solution steps and final answers. Primarily for use as printable class sheets. Requires Internet Explorer, frames, Java, and JavaScript.
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 thenumbertwentyone  Courtney Steketee
Blog posts, which date back to August, 2012, have included "Math Misconceptions Malady," "Classroom Tour," "#made4math #3," "Scoring Scales," "Group Behavior Logs," "Classroom Management," "Translating Words into Math," "Graphing Inequalities Day 2,"
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 The Theorem of Pythagoras  Project MATHEMATICS!, California Institute of Technology
A videotapeandworkbook module that explores a basic topic in high school mathematics in ways that cannot be done at the chalkboard or in a textbook. Several animated proofs of the Pythagorean theorem are presented, with applications to reallife problems
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 Theorem of the Day  Robin Whitty, London South Bank University
Every day, Whitty posts a PDF of a different theorem, lemma, law, formula, or identity  each "as selfcontained as possible." With pictorial interpretation; proof; glossary briefly explaining some parts of the mathematical language; references to related
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 Theoretical and Numerical Approach to "Magic Angle" of Stone Skipping  Shinichiro Nagahiro and Yoshinori Hayakawa, Department of Physics, Tohoku University, Japan
As published in the American Physical Society's Physical Review Letters: Nagahiro and Hayakawa "... investigate the condition for the bounce of circular disks which obliquely impacts on the fluid surface. An experiment [C. Clanet, F. Hersen, and L. Bocquet,
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 Theoretical Computer Science  Elsevier Science
The journal is mathematical and abstract in spirit, but derives its motivation from practical and everyday computation. Its aim is to understand the nature of computation and to provide more efficient methodologies. All papers introducing or studying
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 Theoretical Learning  Peter Moxhay
Information about a pilot project in Portland, Maine, public schools to adapt an approach developed in Russia for early math education (grades 13). Includes contact forms and request forms for Portland area parents to download trial math applets for
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 Theoretical Statistics  Peter Guttorp, University of Washington
A course intended for Ph.D. students in Statistics, Biostatistics, and other quantitative fields. Syllabus, handouts, research projects, homework problems.
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 Theory and Applications of Categories (TAC)
An electronic, refereed journal for articles that significantly advance the study of categorical algebra or methods, or that make significant new contributions to mathematical science using categorical methods. The scope of the journal includes: all areas
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 Theory and Applications of Categories (TAC)  Robert Rosebrugh, Ed.; Mount Allison University
The allelectronic, refereed journal on Category Theory, categorical methods and their applications in the mathematical sciences. The scope of the journal includes: all areas of pure category theory, including higher dimensional categories; applications
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 The Theory Group  University of St. Andrews, U.K.
The Theory Group investigates aspects of theoretical computer science including: specification; automated theorem proving techniques and applications (especially in computer algebra); computational logic, including logic programming and proof theory;
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