 Those Amazing Flying Mathematicians  Keith Devlin (Devlin's Angle)
October is the month when those of us living in the United States see migrating birds moving south for the winter. How do they know which direction to fly?... Assuming that the average bird is not the mathematical equivalent of a college math major, how
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 Thot / Nouvelles de la formation à distance  Denys Lamontagne, Directeur et Rédacteur en Chef
Une base de données de rubriques: cours, logiciels, références, technologies, didactique, arguments, actions, institutions, revue médias, et communiqués. Aussi, des forums animé et archivés.
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 Threedimensional Geometry (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on threedimensional geometry.
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 The Three Jugs Problem  Cut the Knot!, Alexander Bogomolny
Two friends who have an eightquart jug of water wish to share it evenly. They also have two empty jars, one holding five quarts, the other three. How can they each measure exactly 4 quarts of water? ... The description of the 3 Jugs problem as a triple
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 Three Years of Computing: Final Report On The Palindrome Quest  John Walker
A 1990 report on computations on the 196 problem: "Pick a number. Reverse its digits and add the resulting number to the original number. If the result isn't a palindrome, repeat the process. Do all numbers in base 10 eventually become palindromes through
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 Thue Equations  Clemens Heuberger
A special family of equations F(X,Y) = m, where F is an irreducible homogeneous form of degree n at least 3 and m is a nonzero integer. With a list of special cases that have been solved.
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 TI83 / TI84 Games and Programs  Bill Paetzke
Bill Paetzke offers TI83/TI84 Plus programs to help students and teachers be more efficient in using their calculators. The programs are organized under these categories: Algebra, Finance, Geometry, Physics, Programs, Statistics, Trigonometry, and Tutorials.
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 TI84 Basic Programs
Programs for the Ti84 or Ti83+. Available subjects include: limits, derivates, integrals, differential equations, vector plotting, vector calculating, complex numbers. Also for control systems: Nyquist diagrams and many programs for electrical engineering.
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 ticalc.org
The unofficial TIcalculator home page. A nonprofit, collaborative effort geared toward fans of Texas Instruments' graphing calculators, acting as a headquarters for all available information on the subject. It is also the home of ZShell and Fargo, assembly
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 Tickling the Mind  Ivars Peterson (MathTrek)
... Different math teachers may use different styles and methods, and they may favor different topics. However, they all share the goal of building an appreciation of both the usefulness and the intellectual wonder of mathematics. Much of the current
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 Tides and Tide Prediction  Tony Phillips; Dept. of Mathematics, SUNYStony Brook
General information about tides and tide prediction: Priming/Lagging: a calculus with calculators exercise demonstrating the priming and lagging of the tides at Stony Brook. Samples of current tide predictions from the National Ocean Service. TideSounds:
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 TierneyLab Puzzles  John Tierney
Challenging word problems that "put ideas in science to the test," from The New York Times' science columnist. Solve and comment on the puzzles and their extra credit extensions. See also Tierney's blog entries on mathematics.
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 Tiled CA  Brian Prentice
An interesting variation on the traditional 2D Cellular Automata simulators, for Windows.
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 Tile.Net  ListUniverse.com
A comprehensive Internet reference site for finding discussion lists (mailing lists); Usenet newsgroups; FTP sites; computer products and vendors; and Internet and Web design companies. Search mailing lists by keyword (algebra, calculus, etc.) to find
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 Tiletris  Oktay Haracci
A tiling program for aperiodic or periodic tiling. Freeware, for PCs only, running Win 9x/2000. Help, including instructions, available on the site.
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 Tiling and Packing results  Torsten Sillke
Packing problems, mostly, in English, with some in German. Packing Polycubes and Polyspheres; Tilings with Matching Conditions; links.
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 Tiling Plane and Fancy  Steve Edwards
The 17 wallpaper groups identify the plane symmetry groups and link to background patterns illustrating them. Tiling Definitions define, with examples, the terms fundamental region, isohedral tiling (isohedral and nonisohedral), isogonal tiling, lattice,
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 Tilings and Geometric Ornament  Kaplan, Salesin
A project designed to explore the intersection between computer graphics, geometry, and ornamental design. Papers and illustrations on Escherization, Islamic Star Patterns, Parquet Deformations, Symmetrohedra, and Voronoi Diagrams.
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 Tilings (Graphics Archive, Special Topics)  The Geometry Center
Regular subdivisions of the plane or space.
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 Tilings (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on tilings. One way to define a tiling is a partition of an infinite space (usually Euclidean) into pieces having a finite number of distinct shapes. Tilings can be divided into two types, periodic and
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 Tiling with Polyominoes  Ivars Peterson (MathTrek)
"Mathematicians have proved that the general question of whether it's possible to cover the plane with identical copies of a given finite set of tiles is, in principle, computationally undecidable. In other words, there's no cookbook recipe or handbook
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 TiltAWhirl Chaos  Ivars Peterson (MathTrek)
The amusement park TiltAWhirl spins its passengers in one direction, then another... A rider never knows exactly what to expect next. Yet these complicated, surprising movements arise from a remarkably simple geometry. A passenger rides in one of seven
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 TI Math  Texas Instruments, Inc. (TI)
Activities (by subject and technology type), events, research, professional development, and resources, for the high school crowd and beyond.
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 Timelines and Scales of Measurement  Niel Brandt
TEX, DVI, PDF, Postscript, and ASCII files: Science / Technology History Timeline; Evolutionary / Geological Timeline; Cosmological Timeline; Scales of Measurement.
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 Time Series Analysis and Forecasting; AUTOBOX  Automatic Forecasting Systems (AFS) Corporation
Autobox for Windows provides forecasting based on the BoxJenkins modelbuilding process, implemented for both ARIMA (univariate) modeling and Transfer Function (multivariate or regression) modeling. Features, prices, faqs, support, and mathematical information
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 TINspire: Taking Learning to New Heights  Marc Garneau
A blog about the TINspire™ graphing calculator, and its use in the classroom. Includes Garneau's handout from the T^3 International Conference in Seattle, 2009, on Tips and Tricks for the TINspire.
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 Tips & Tricks to Gothic Geometry  Joe Chiffriller; NewYorkCarver.com
The geometry of gothic cathedrals: how to construct a trifoil design, an ogee arch, and a rose window. With links to cathedral and castle tours.
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 Tomoko Fuse Origami Quilts  Jeff Kerwood
These origami quilts were designed and made by Jeff Kerwood, using the modules developed by Tomoko Fuse, a Japanese origami artist universally acknowledged as the master of modular or unit origami. In modular origami, the model is built up from multiple
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 Tomás Oliveira e Silva
From an assistant professor in the Electronics and Telecommunications Department of the University of Aveiro, Portugal. On the Collatz problem: maximum number tested (N): 91·2^50 = 102456891522678784.
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 Tony Phillips  Dept. of Mathematics, SUNYStony Brook
Ongoing Web math projects: Honors Calculus; Visualizing Women in Mathematics, the Physical Sciences and Technology; Calculus Reform; Geometry of the Binary Tetrahedral Group in SU(2); Mazes; Tides; Integrating Research and Education (RAIRE); Math Photo
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 Tools for Decision Analysis: Analysis of Risky Decisions  Hossein Arsham
Decision making under risk is presented in the context of decision analysis using different decision criteria for public and private decisions based on decision criteria, type, and quality of available information, together with risk assessment. Also
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 Tools for Exploring Mathematics (TEMATH)  Mathematics Dept., UMass Dartmouth
A software package useful for learning and teaching algebra, precalculus, calculus, linear algebra, and applied mathematics, with a graphical interface that makes it easy to use for the computer novice. Information about TEMATH, a tour of the programs,
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 Too Much to be a Coincidence? (Math Chat)  Frank Morgan, MAA Online
Answer to the Challenge: In the September ACBL Bridge Bulletin, Noreen Wurdemann of the Bahamas reports that the two bridge hands below were dealt out at her club. She says that she is "100% certain there was no hankypanky." What is the probability of
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 Top 100 Mathematics Software  Adam Testad, Kuala Lumpur, Malaysia
A top 100 list of mathematics software: shareware, freeware, payware, some hardware, and some Web sites. A selection from over 24,000 products with references to download sites, suppliers page, and PC literature references.
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 Topical Index of Internet Resources (The Chaos Hypertextbook)  Glenn Elert
An extensive list of links to sites related to Elert's Chaos Hypertextbook. Major categories include: Chaos (Dynamical Systems); Dimension; FAQs; Feigenbaum Constants (Bifurcation Diagrams); Fractals; Image Compression; Iterated Function Systems (IFS);
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 Topics in Arithmetic and Elementary Mathematics  E. Lee Lady; University of Hawaii
Materials used in a university course for prospective elementary school teachers, to teach them how to be interested in mathematics. Materials are in PDF and DVI, and include: representing numbers in other bases, divisibility tests, periodic decimal expansions,
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 Topics in Calculus  Alan Cooper, Dept. of Mathematics & Statistics, Langara College
Calculus resources for college students: a topicbytopic guide to Webbased materials. Topics include: Precalculus review; limits and continuity; derivatives; approximation; antiderivatives; integration; infinite series; parametric equations; polar coordinates;
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 Topics in Calculus  E. Lee Lady; University of Hawaii
Files in PDF, DVI, and Postscript formats, to help students learn to use calculus in applications and to have confidence in setting up formulas using derivatives and integrals. Contents include: a conceptual approach to applications of integration, maxmin
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 Topics in Geometry  Don Shimamoto, Swarthmore College
Six sketches related to hyperbolic geometry. One illustrates that hyperbolic reflection in the Poincare disk corresponds to Euclidean inversion. Two sketches illustrate transformations that may or may not be hyperbolic rotation and translation. One sketch
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 Topics in Integral and Differential Calculus  Teresinha Kawasaki
Interactive, illustrated introductions to polynomial functions, trigonometric functions, exponential and logarithmic functions, the derivative, differentiation formulas and the chain rule, differentiating trigonometric functions, maxmin problems, integration,
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 Topics in Mathematical Recreations
Arithmetic and geometric puzzles; polyhedra; fractals and chaos; board and positional puzzles; pi and its calculations, and tiling patterns, which can be thought of as making an infinite polyhedron. Includes a bibliography ranging from Abbott's Flatland
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 Topics in Mathematics  Felynx Cougati Project; University of Alberta
An extensive site in the following topics: Foundational Ideas (Space and Dimension; Sets and Functions); Differential Calculus (Single Variable; Several Variables); Linear Algebra (Vector Spaces; Matrices; Linear Maps; Determinants); Topology (Topological
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 Topics in Precalculus  Alan Cooper, Dept. of Mathematics & Statistics, Langara College
Precalculus resources for college students: a topicbytopic guide to Webbased materials. Topics include: The Real Numbers; Cartesian Coordinates; Relations and Functions; Linear Functions; Quadratic Functions; Polynomials; Rational Functions; Radicals
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 Topics in Probability  Wlodzimierz Bryc
Books in DVI, PS and HTML formats: Normal Distribution: characterizations with applications; Applied Probability & Stochastic Processes; Large Deviations: Performance analysis.
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 Topological Groups, Lie Groups  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to Lie groups, an important special branch of group theory. They have algebraic structure and yet are also subsets of space, and so have a geometry; moreover, portions of them look just like Euclidean
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 Topological Knot Theory Information & Research  Claremont High School, Claremont, CA
Files and data related to the knot theory work developed by students at Claremont High School. A TeX file contains source code for the Paper "Tabulating Alternating Knots Through 14 Crossings," by B.Arnold, C.Candy, K.Erdener, J.Fan, J.Hoste, R.J.Muir,
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 Topological Space: Definition and Basic Theorems  Michal Wojcik
This page contains the definitions of the following concepts: topological space, open set, closed set, interior, closure. Contains the most basic theorems about these concepts together with an easytoread proof which is slightly informal in some places.
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 The Topological Zoo  The Geometry Center
For mathematicians and educators: a visual dictionary of surfaces and other mathematical objects, consisting primarily of movies, still images and interactive pictures. Can be used to complement classroom presentations, research papers and talks. Each
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 Topology Atlas  Shakhmatov and Watson; York University, Toronto, Ontario, Canada
A multipurpose center for electronic distribution of information related to topology, the mathematical study of surfaces, sometimes called "rubber sheet geometry" because topologists consider geometric figures as though they were drawn on infinitely
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 Topology  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to general topology, the study of sets on which one has a notion of "closeness"  enough to decide which
functions defined on it are continuous. Thus it is a kind of generalized geometry (we are still
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