 Drums That Sound Alike  Ivars Peterson (MathLand)
Peterson writes that physicists and mathematicians have long recognized that the shape of the boundary enclosing a membrane plays a crucial role in determining the membrane's spectrum of normalmode vibrations. He outlines the progress made on Mark Kac's
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 Drunkard Walk  Vladimir Gusev
An applet illustrating the onedimensional drunkard walk algorithm, which describes the process of molecular diffusion in an equilibrium gas.
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 Dr. Vogel's Gallery of Calculus Pathologies  Thomas I. Vogel; Dept. of Mathematics, Texas A&M University
In learning calculus, students develop intuitive ideas of such concepts as limit, continuity, differentiability, and so on, useful in dealing with simple examples, but potentially a hindrance to deeper understanding of the basic concepts of mathematical
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 DS Dynamical Systems (Front for the Mathematics ArXiv)  Univ. of California, Davis
Dynamical Systems preprints, from the U.C. Davis front end for the xxx.lanl.gov ePrint archive, a major site for mathematics preprints that has incorporated many formerly independent specialist archives. Search by keyword or browse by topic.
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 DSP First: A Multimedia Approach  McClellan, Schafter, & Yoder
The CDROM portion of the book, containing, for each chapter: Demos  quicktime movies, sound files, etc. that help reinforce the concepts introduced in the text; Labs  MATLAB based laboratory exercises for indepth study of certain concepts and ideas
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 Duke University Math Union  Jadrian Miles
The Duke University Math Union (DUMU) writes and hosts the annual Duke Math Meet. Download PDFs of problems and solutions from meets dating back to 1998.
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 Dynagraph  Rouben Rostamian, University of Maryland, Baltimore County
Dynagraph is a 3D plotting utility for the X Window System. It draws 3D curves and surfaces representing mathematical expressions and numerical data, and allows for interactive rotation, zooming, and other manipulations of the displayed images. Read the
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 The Dynamical Systems and Technology Project at Boston University  Robert L. Devaney; Dept. of Mathematics
An NSFsponsored project designed to help secondary school and college teachers of mathematics bring contemporary topics in mathematics (chaos, fractals, dynamics) into the classroom, and to show them how to use technology effectively in this process.
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 Dynamical Systems data base  Giuseppe Zito
A database of around 50,000 planar dynamical systems of the type described by the formula: x = f(x,y), y = g(x,y), where f and g are algebraic functions containing constants and the four operations. The database has been used to test new visualization
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 Dynamical Systems (Graphics Archive, Special Topics)  The Geometry Center
Modeling the timeevolution of the state of a physical system of quantities, attempting to understand all possible longterm behaviors.
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 Dynamical Systems Home Page  Mathematics Department, SUNYStony Brook
Links to announcements, conferences, a thesis server, seminar schedules, open problems in dynamical systems, programs to draw pictures of dynamical objects, a bibliography, and links to similar pages.
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 Dynamical Systems on the Torus  Paul Trow
An illustrated essay introducing dynamical systems on the torus.
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 dynamicalsystems.org
An interactive laboratory on dynamical systems, in particular on particle systems. Software, Documents, and Links. Animated features include: Nonlinear chain; Forced Pendulum; Fermi system; Vlasov billiards; Vortex motion; 3 Body Problem; Convex Billiards;
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 Dynamic Geometry Sketches  Michael de Villiers
Interactive dynamic geometry sketches with JavaSketchpad, Cinderella & GeoGebra. Includes interactive sketches for Van Aubel's theorem, generalizations of the ninepoint circle and Euler line, FermatTorricelli point, and several Student Explorations
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 Dynamic Labyrinths  Inge Schwank, Institute for Cognitive Mathematics, Department of Mathematics and Computer Science, University of Osnabrueck
Labyrinth construction sets to download or play online with Flash plugin.
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 Dynamic Web Tools Using webMathematica  Steve Wilson and Mike Martin, Johnson County Community College, Kansas
Interactive Web pages that allow students and faculty to compute and visualize mathematical results directly from a Web browser. Primarily for undergraduate courses, the pages are grouped by categories and a given page may be listed under several categories
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 Dynamische Geometrie Systeme (DGS)  Dr. Dörte Haftendorn
In German. Characteristics and comparisons of dynamic geometry systems; Euklid: characteristics, material, notes, software, lessons; TI92 calculator Cabri Geomètre materials. You may send for a 40page booklet on "Dynamic Geometry of Systems"
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 Dyslexia  George Row
A compensium of links to other WWW pages and discussion groups on Dyslexia: basics, organizations, bibliographies, archives, software, research; also special needs education in general; and pointers to general disability information.
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 e = 2.7182818285...  Rick Fowler; University of Saskatchewan, Canada
History of and information about the number e, with links to sites on the Web and a hard copy reference.
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 EAGER (European Algebraic Geometry Research Training Network)  Wolfram Decker
The members of EAGER are algebraic geometers in mathematical centres spreading among most European countries. These centres are grouped into twelve geographical nodes which are responsible for the management of joint research projects and for the training
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 E and M  Finzer, Berkelman, Bennett; Key Curriculum Press
Two sketches showing how to model force fields. One sketch models a capacitor, and the other shows the strength at various points of the field generated by two charged particles.
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 Earliest Known Uses of Some of the Words of Mathematics  Jeff Miller, Gulf High School, New Port Richey, FL
An extensive list, with examples, sources, and contributors. These pages attempt to show the first uses of various words used in mathematics. Research is ongoing, and the uses cited should not be assumed to be the first uses that occurred unless it is
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 Earliest Uses of Various Mathematical Symbols  Jeff Miller, Gulf High School, New Port Richey, FL
An attempt to identify the individuals who introduced various common mathematical symbols, along with the dates and name of the document in which the symbol first appeared: symbols of operation; grouping symbols; symbols of relation; fractions and decimals;
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 Early Calculators  David G. Hicks
Some history on slide rules and their types and makers, as well as basic instructions on their use. Also Planimeters, Calculating Machines (adding machines, four function mechanical calculators, how calculating machiens worked), and Early Electronic Models.
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 Early Career Profiles: Recent bachelorslevel graduates in the mathematical sciences  American Mathematical Society
A collection of profiles of alumni from a variety US colleges and universities who majored in mathematics. Each profile includes statements of what the alumnus or alumna now does, the math each uses on the job, the recent graduate's educational background,
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 Earth/matriX: Science in Ancient Artwork & cience Today  Charles William Johnson GonzálezCasanova
Analyses of ancient reckoning, a summation of Fermat's Last Theorem through simple addition and lastdigit patterns, the AntiRadian, ancient Pi, an
alternative proof of the Pythagorean Theorem to the power of three, the
ancient mediatio/duplatio
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 Easier Fibonacci puzzles  Ron Knott
Puzzles that are simply related to the Fibonacci numbers....; Brick Wall patterns; Making a beeline with Fibonacci numbers; Chairs in a row; Stepping Stones; Fibonacci numbers for a change!; Telephone Trees ; Leonardo's Leaps; Fix or Flip; Two heads
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 EASI Street to Science, Engineering, and Math (SEM)
Equal access to software and information: an NSFsponsored project to collect and disseminate information on tools that make these fields more accessible to professionals with disabilities. Online workshops, Webcasts, links to programs for the visually
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 Easy Calci  Manoj Prabhakar
Calculators for linear algebra, statistics, length conversions and other measurements, interest and other financial topics, and more.
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 EasyFit: DistributionFitting Software  Mathwave Technologies
Automatically or manually fit probability distributions to data and select the best model in seconds. Key features include support for over 40 probability distributions, goodness of fit tests, and highquality interactive graphs. For Windows. Free trial
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 Easymaths  Echelon Systems Ltd.
A UK math site with GCSE tutorials, notes to be used as introductions to topics or for revision; an Exam Bank with examstyle questions and model answers for ages 1216; book reviews, a Practice Room with practice maths problems and tips for solving them;
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 EASYpEXPR: Writing Expressions in Pure HTML  Giovanni Artico
Enter an expression in the textbox, and the page will return the HTML code that would show the expression in standard visual form.
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 Easy Translator  Mapperz
Convert data from AutoCAD (DWG/DXF), CSV, GeoJSON, GML, GPX, DGN (v7), MapInfo (TAB), KML, or ESRI (Shapefile) into WGS84, WGS84 (GeoCentric), Mercator Projection, Robinson Projection, or Spherical Mercator.
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 Eat. Sleep. Math.
A Tumblr "repository for mathrelated links, anecdotes, code, and random thoughts" by a UCLA undergraduate. Posts, which date back to November, 2013, have included "Yesterday my friend and I passed Terence Tao in the MS building while I was explaining
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 eCalculus  D. P. Story, Mathematics & Computer Science, Univ. of Akron
A Calculus I tutorial written in TeX and converted to Adobe PDF. Features include verbose discussion of topics; typeset quality mathematics; inline examples and exercises; interactivity in the form of multiple choice questions and quizzes; and popup
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 ecalculus.org: The Calculus Page  Hass, Kouba, University of California, Davis, CA
Resources for calculus students: calculus problems with solutions; sample exams; excerpts from "How to Ace Calculus" (the Streetwise Guide); animations; tips on preparing for exams; mathematics and the job market (professions that use mathematics); and
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 ECC Tutorial  Certicom
Elliptic Curve Cryptosystem Classroom introduces elliptic curves and how they are used to create a secure and powerful cryptosystem: elliptic curve groups over real numbers, over Fp, over F2m, and the discrete log problem. Certicom's 109bit and other
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 EcEdWeb: Economic Education  Kim Sosin, Univ. of Nebraska at Omaha (UNO)
Teaching resources for economics teachers from K12 to college/university level, plus links to particularly useful sites for economics information and data for teachers and students. Two economics organizations, the National Association of Economic Educators
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 Economic and Game Theory  David K. Levine, Department of Economics, UCLA
A site that uses the tools of modern economic theory and game theory to explore how the interaction of intelligent goalseeking individuals determines social outcomes. The site offers general interest material, undergraduate and graduate course material,
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 Economic Research Service (ERS)  U.S. Department of Agriculture
This agency studies agriculture, food and nutrition, the environment, rural development, and international trade. Research reports, press releases, commodities reports, books, and other publications available online or for download in PDF format, with
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 Economics of Networks Internet Site  Nicholas Economides
A collection of information on economic issues of networks, such as the Internet, telephone and fax communications networks, railroads etc. One of the fundamental features of networks is that the value of a network service increases as the network expands,
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 EDeafMath  Dawn Kidd
Vlog for anyone who teaches "at least one deaf or hard of hearing student." Posts, which date back to February, 2013, include "Texas Math Sign Language Dictionary" and "50 Plus Ideas for Using Document Cameras in the Classroom." Kidd teaches middle school
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 EDGE: EmbeDded Graphing Engine  Hydrix
A graphing engine that can quickly and accurately graph a broad range of algebraic relations. Additionally it can identify and display regions where the relation is undefined. Demo version on the web.
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 Edinburgh Mathematical Society (EMS)  Chris Smyth, EMS Secretary; Edinburgh University
Founded in 1883 for "the mutual improvement of its members in the Mathematical Sciences, pure and applied"; the principal mathematical society for the university community in Scotland. Its membership is drawn from all the Scottish universities and other
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 EdNext
A utility that allows searches defined by grade level, subject, and specific topic. Select subject: mathematics to search for more than 8,000 math sites.
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 Ed Tech Tools  University of Hawaii
Free, webbased tools for educators, featuring QuizMaker 2.0, which allows users to create and correct online quizzes easily and quickly, without any knowledge of HTML. It provides instant feedback to students, and/or package answers in an email that
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 Educational Interests  Keith Lynn
See, in particular, Lynn's Math Modeling Project, which features Java applets to produce quadratic and sine examples; and Dynamics Project, on the Julia and Mandelbrot sets.
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 Educational Resources  Avraham Goldstein
CGI for solving quadratic and cubic equations, performing polynomial division with remainder, finding real and complex roots of cubic equations, and analyzing polynomial functions (determining first and second derivatives, local maxima, minima, inflection
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 Educational Technologies  TECFA, WWW Virtual Library
This site offers a selection of best pages dealing with educational technology; trees of concepts (guided search: educational software, artificial intelligence, constructivist design, virtual reality, distance education, etc.); the opportunity to make
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 The Educational Validity of Visual Geometry  Marius Blok; Hull, UK
A 1998 doctoral thesis describing the design of a new branch of geometry and its teaching, based on philosophy and visual art, avoiding the use of formulae and computations. The site provides a table of contents, preface, and summary, as well as contact
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