 Worldwide Center of Mathematics  David B. Massey
The videotextbooks Worldwide Differential Calculus and Worldwide Integral Calculus with Infinite Series feature linked crossreferences, popup margin comments, interactive graphs, and relevant teaching videos embedded directly within its chapters. The
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 World Wide Web Course Tools  WebCT
WebCT can be used to create entire online courses, or to publish materials that will supplement existing courses. It uses WWW browsers as the interface for the coursebuilding environment; other than the browser, there is no special software to install.
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 WorldWideWeb for Operations Research and Management Science (WORMS)  Moshe Sniedovich; Dept. of Mathematics & Statistics, Univ. of Melbourne
A grassroots WWW site established by the Operations Research Group (ORG) at the Department of Mathematics, The University of Melbourne, Melbourne, Australia. WORMS' main objective is to complement the formal online activities of OR/MS Societies worldwide.
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 Writing a Math Phase Two Paper  Steven L. Kleiman, with Glenn P. Tesler; MIT
A discussion of the kind of writing appropriate in a paper submitted to the math department to complete Phase Two of MIT's writing requirement: a review of the general purpose of the requirement and the specific way of completing it for the math department;
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 Writing Assignments in Calculus  Tommy Ratliff; Dept. of Mathematics & Statistics, Wheaton College, Norton, MA
Imaginative paper proposals for SingleVariable and Multivariable Calculus courses cover subjects from "Confusion in Beverly Hills" (geometry, trigonometry) to "The XFiles Makes Me So Angry" (optimization of a function of two variables)  and many more.
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 Writing for a Math Class  B. Sidney Smith, Wendy Hageman Smith; Math Academy Online/Platonic Realms
A "minitext" concerning written communication in mathematics classes, for both students and teachers. Teachers' section discusses possible formats and assessment, and gives sample lessons; students' section gives practical tips on approaching a written
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 Writing in Mathematics  Dr. Annalisa Crannell; Franklin & Marshall College
Dr. Crannell's Guide to Writing in Mathematics, the checklist she uses, and writing assignments from her PreCalculus and Calculus I, II, and III classes. Contents include: Why Should You Have To Write Papers In A Math Class?; How is Mathematical Writing
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 Writing Proofs  Leslie Lamport
PostScript, DVI, and LaTeX versions of each (but no HTML) are available. How to Write a Proof: A method of writing proofs is proposed that makes it much harder to prove things that are not true. The method, based on hierarchical structuring, is simple
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 Writings for a General Audience  Marcus Jaiclin
PDF articles on popular and recreational mathematics by Jaiclin, an Assistant Professor at Westfield State University: Notes on Mathematics of Voting Methods; Fractals, Pascal's Triangle, and the padic Numbers; Airplane Passenger Seating Problem; No
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 wrotniak.net  J. Andrzej Wrotniak
Includes shareware and freeware programs for Windows written by Wrotniak: scientific and regular calculators, a spherical geometry calculator, a logic and strategy game, a statistics graphing program, and a simple program to compute the area of a polygon.
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 www4teachers
A center for practical ideas about technology in education. Articles published online, updated monthly: teacher interviews on firsthand classroom technology; interviews with educational technology leaders; interviews with kids; howto columns on classroom
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 www.caseymongoven.com  Casey Mongoven
In his music, Casey Mongoven works with Fibonacci numbers, related sequences, and the golden ratio. The site includes scores, writings, WAVs, and MP3s among other files available for download. In English and German.
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 WWWMath Discussion Group page  Phillip Kent
An email discussion group dedicated to the subject of Mathematica and its interconnection with the WWW, HTML, VRML, Java, and other topics. This site includes a policy statement, how to subscribe, a mail archive, answers to frequently asked questions,
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 www.MonteCarloSimulations.org  The Monitor Group, Inc.
A resource library for planners interested in learning more about Monte Carlo and other tools to deal with uncertainty. Read "What is Monte Carlo?" and "Why Monte Carlo?" Find events, literature, software, and more.
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 WWW Resources for Teaching Statistics  Robin Lock; Mathematics Dept., St. Lawrence Univ., Canton, NY
A paper presented at Technology in Statistics Education, a 1998 conference for teachers sponsored by the Boston Chapter of the American Statistical Association. Its purpose is to direct readers to typical statistics instruction support sites on the WWW.
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 www.TItutorials.com  Mark Turner
Online instructional tutorials and CDROMs for using Texas Instruments graphing calculators (TI83 or TI83 Plus) in mathematics courses. (You must register and pay a onetime fee.)
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 XGC: an eXtension of Goldbach's Conjecture  Andrea Ercolino
XGC is based on a new version of the Eratosthenes' Sieve. GC: Every natural n = 2*k, where k >= 3, is the sum of 2 odd primes. XGC(c,m): Every natural n = m*k, where k >= c + m, is the sum of m numbers belonging to the Euclid(c,m) set. Includes
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 XLpert  Choong Koon Wai, XLpert Enterprises
Shareware and freeware: 4Cast XL (a neural network addin for MS Excel); xl bit (a genetic algorithm addin for MS Excel); nn_Solve (build neural network models with Excel Solver (freeware)); KaotiXL (rescaled range analysis ( Hurst exponent ) with MS
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 Xmorphia  Roy Williams
Pattern formation from differential equations  an exhibition of images and movies. Morphogenesis from a ReactionDiffusion System: Xmorphia is intended to show the variety of patterns that may be exhibited by a relatively simple parabolic partial differential
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 Xtoys  Michael Creutz
Download cellular automata simulators for the Xwindows operating system, or a PostScript document describing them. See also the gallery of examples.
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 The XYZ GeoBench for experimental geometric computation  Dr. Peter Schorn
The XYZ GeoBench (eXperimental geometrY Zurich) is a workbench for geometric computation on Macintosh computers. It provides an interactive user interface similar to a drawing program which can be used to create and manipulate geometric objects such as
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 Yahoo! Science: Mathematics: History  Yahoo! Inc.
Searchable math history links: Mathematicians, Pi, and miscellaneous links.
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 Yahoo! Science: Mathematics: Numerical Analysis: Numbers: Specific Numbers: Pi  Yahoo! Inc.
A searchable collection of approximately 100 WWW pages having to do with Pi, in the following categories: Calculating Pi; Clubs; Decimal Digits; History; Holidays; Mnemonics; Poems; Search Engines; Web Directories.
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 Yahoo! Science: Mathematics  Yahoo! Inc.
All the best on the Web in math including Indices, alphabetically listed by category: Academic Papers; Algebra; Applied Mathematics; Books; Calculus; Chaos; Combinatorics; Complex Systems; Conferences; Education; Employment; Entropy; Equations; Ethnomathematics;
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 Yahoo! Search Options  Yahoo!
Search all of Yahoo by keyword.
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 Yahoo  Yahoo! Inc.
Search the entire Yahoo database or within categories and subcategories. Major categories include Arts & Humanities; Business & Economy; Computers & Internet; Education; Entertainment; Government; Health; News & Media; Recreation &
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 Yarrow Home Page  Jan Zwanenburg
A proofassistant for Pure Type Systems (PTSs). In Yarrow you can experiment with various pure type systems, representing different logics and programming languages. A basic knowledge of Pure Type Systems and the CurryHowardde Bruijn isomorphism is
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 YMath Mathematical Models  Jan de Koning
Models and building boxes for education include magnetically connectable "mathmaker" and "polylinks," and tetrahedron puzzles. Other polyhedral furniture and housewares include cube moneyboxes of plywood, copper, and brass; dodecahedron bottle openers;
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 You Have Found The Prisoners' Dilemma (Serendip: Playground)  Bryn Mawr College
Play a nonzerosum game where the best strategy for a given player is often one that increases the payoff to one's partner as well. The rules: on each turn of the game, you and your opponent must choose, without knowing the other's choice; following
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 Young Mathematicians' Network
A loose organization of mathematicians in the junior part of their careers. The site includes the newsletter Concerns of Young Mathematicians, with back issues and an interactive newspaper version online; and links to employment, grant, organizational,
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 Your Mathematics Society  ChatArea.com
A chat area/forum for all mathematics questions. General mathematics, algebra, calculus, geometry/trigonometry, statistics, calculators, and history of mathematics are covered.
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 Youth Accounts  FORUM Credit Union
Financial literacy games, stories, activities, articles, calculators, videos, and other resources  each set to a musical soundtrack  for learning about finance. Children aged 27 learn with Flip and Flop the frogs; eight to twelve yearolds, with
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 Yuri Matiyasevich
Yuri Matiyasevich is best known for finding a negative solution to Hilbert's Tenth Problem, which has applications to the theory of algorithms, algebra, number theory, model theory, proof theory, and theoretical computer science. As well as information
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 Yves Gallot's Proth.exe and Cunningham Chains  Warut Roonguthai
A collection of interesting Cunningham chains of large prime numbers (with a link to an explanation of Cunningham chains), and how to find some of them using Yves Gallot's Proth.exe, a Windows 95/NT program.
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 Zahlen  Peter Hartmann
A list of many different types of numbers, with references. In German.
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 ZCA Kaiserslautern  Olaf Bachmann
The Zentrum für Computeralgebra (Centre for Computer Algebra) at the University of Kaiserslautern is a scientific institution of the departments of Mathematics, Computer Science, and Electrical Engineering at the University of Kaiserslautern in Germany.
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 ZDNet University  ZiffDavis
ZiffDavis computer magazine publishers (PCWeek, MacUser, InternetUser, FamilyPC, etc.) sponsor online feebased computer classes and seminars taught on private moderated message boards. Most classes last 48 weeks, teachers have chat "office hours,"
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 Zeno's Paradoxes  Franz Kiekeben
Statements of the following paradoxes: The Racetrack (or Dichotomy); Achilles and the Tortoise; The Arrow; A brief analysis of the motion paradoxes; The Thomson Lamp; Kiekeben's Odd/Even Paradox; Benardete's Paradox of the Gods;
The Paradox of the Spaceship;
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 Zentralblatt MATH Database  SpringerVerlag
A database edited by the European Mathematical Society, the FIZ Karlsruhe, and the Heidelberg Academy of Sciences, and established in cooperation with Math Doc Cell (France). Search for abstracts of papers on any math subject by author, title, classification,
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 Zero in Four Dimensions: Cultural, Historical, Mathematical, and Psychological Perspectives  Prof. Hossein Arsham; University of Baltimore
A critical panoramic view of basic mathematical fallacies surrounding zero, such as dividing by zero, taking the limit, IEEE special floating point, the notion of zero throughout history, when zero is "not there," the origin of infinity and its symbol,
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 Zeroing In on Catalan's Conjecture  Ivars Peterson (MathTrek)
Preda Mihailescu of the Swiss Federal Institute of Technology in Zurich has
proved a theorem that is likely to lead to a solution of Catalan's conjecture, a
venerable problem involving relationships among whole numbers (in 1844, Catalan asserted that,
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 Zeta related functions and proof of Riemann's Hypothesis
Recent studies on Zeta functions and a proposed proof of Riemann's Hypothesis. Theorem of El'Melik; Proof of "Riemann's hypothesis" by above identities; Other Zeta related functions.
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 ZetaTrek  Rohit Gupta
An "online expedition of science and math hobbyists across the world," ZetaTrek mobilizes citizen scientists to promote the history and culture of mathematics, and involves them in research, with particular emphasis on solving the Riemann Hypothesis.
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 Zombie Cat  Diego Fonstad
Zombie Cat shares learning catalysts  those "perfect stories, explanations, or methods to teach complex mathematical and scientific concepts." Insightful math learning catalysts date back to January, 2011, with categories such as "Videos worth watching"
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 Zome Geometry: Handson Learning with Zome Models  George W. Hart
An upcoming book full of things you can make with the Zome System geometry construction set  a handson guide to the geometry of threedimensional space. Contents include: Angles, Polygons, Polyhedra; Icosahedron and Dodecahedron; Platonic Solids; Counting;
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 Zome System  Zometool, Inc.
Available in kits of various sizes, Zometool is a 31zone design tool and educational toy for kids, hobbyists, students, teachers and researchers. Precisionmolded in ABS plastic, Zometool models spatial structures representing hyperspaces of up to 31
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 Zome: Truncated 120cell  PCMI @ Math Forum: SSTP 2007
One of the activities at the 2007 Secondary School Teachers Program in the Park City Mathematics Institute was the construction of a truncated 120cell using Zometool. View both an explanation of the mathematics and photos of the construction.
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 Zoomin Calculus  Susan J. Northridge
Short instructional videos for students in calculus and precalculus. Topics include algebra, unit circle, natural logarithms, exponents, limits, derivatives, applications of differentiation, integrals, and more.
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 Z's Roguelike Stuff  Zeno Rogue
Mathematical games and projects include HyperRogue, a treasurecollecting, goblinkilling adventure set in nonEuclidean space  specifically, a hyperbolic plane of negative curvature filled with elixirs and slime beasts; and Hydra Slayer, which begins
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 Z Systems, Inc.
Developers of data analysis, acquisition, and visualization software. Evaluation copies available for download. Graphing and data analysis software includes Graph++, a graphing application that evaluates equations and mathematical functions graphically.
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