- Double Bubble Conjecture Proved (Math Chat) - Frank Morgan, MAA Online
Four mathematicians have announced a mathematical proof of the Double Bubble Conjecture: that the familiar double soap bubble is the optimal shape for enclosing and separating two chambers of air. In an address to the Undergraduate Mathematics Conference
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- Doug's Home Page - Douglas J. Ingalls
Includes mathematical interests such as images of fractal applications of Newton's Method and Gibb's Phenomena, with related programs in FORTRAN and BASIC, a discussion of the apparent depth problem in optics, and how multiple decisions can be reduced
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- Downloadable Preprints - Dept. of Applied Mathematics and Statistics, Stony Brook
Abstracts of papers (1991-) written by faculty and students in the department. Complete papers are available in PostScript, and can be downloaded from this site. They are also available via anonymous ftp. Recent Ph.D. Theses are also available.
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- Downloads - Mac - Mathematics - CNET Download.com
Search this site to find a particular piece of software for the Mac, or browse their mathematics listings.
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- Downloads - PC - Mathematics - CNET Download.com
Search this site to find a particular piece of software for the PC, or browse their mathematics listings.
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- DPGraph (Dynamic Photorealistic Graphing) - David Parker
Software that allows you to: display multiple simultaneous dynamic photorealistic 3D implicit equalities and inequalities, and intersections of their volumes; spin, slice, and view time-dependent (moving) photorealistic surfaces in real time; and construct
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- DPlot Plotting Software for Scientists and Engineers - David Hyde
A general purpose XY plotting program that features multiple scaling types, including linear, logarithmic, and probability scales, as well as several special-purpose plots: tripartite grids (shock spectra), grain size distribution plots, and polar plots.
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- Draft version of MSC2000 - European Mathematical Society (EMS)
The proposed revision of the 1991 Mathematics Subject Classification (MSC), the classification used by the two reviewing journals Mathematical Reviews (MR) and Zentralblatt für Mathematik (Zbl) since the beginning of 1991. MSC2000 is the result of
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- Drawing Tools - Shai Duvdevani
A growing group of .NET C# programs intended to make life easier for highschool and university students studying subjects such as math, computers and electronics. Each of these programs features saving and loading, so that sharing a drawing of logical
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- Drayton Analytics
A provider of optimisation-related software to the Australian operations research community, and economic consulting services to the utility industries.
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- DreamCalc for Windows - Andy Thomas
A freeware scientific calculator for Windows, intended to replace standard hand-held calculators. Fully featured range of math, scientific, statistical & financial functions. Supports natural fractions, complex numbers, base-n logic, unit conversions
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- Dream Frequency .com
CGI web applications to calculate the factors of a number, calculate the prime numbers below a number, test a number for primality, calculate a word's position in the alphabetically sorted list, convert hex to ASCII, or convert temperature from celsius
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- The Drills To Play - Cut the Knot!, Alexander Bogomolny
An exploration of a detail found at the beginning of Kurt Godel's biography by John Dawson, how repetition and practice constitute an integral and necessary part of the learning process; that, by implication, one first conceives an idea, then proves it
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- Dr Len Fisher: Opening the Door to Science - Len Fisher
Fisher concentrates on the science of the everyday and making science accessible. His latest book is Rock, Paper, Scissors: Game Theory in Real Life. The site contains excerpts from his books as well as descriptions of his talks, articles about his work,
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- Dr. Rich's Page o' Math
Math problems in algebra, trigonometry, and calculus, posted more or less monthly (past puzzles, with solutions, are on the Web).
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- 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 normal-mode vibrations. He outlines the progress made on Mark Kac's
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- Drunkard Walk - Vladimir Gusev
An applet illustrating the one-dimensional 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 e-Print 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 CD-ROM 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 in-depth 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 NSF-sponsored 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 time-evolution of the state of a physical system of quantities, attempting to understand all possible long-term behaviors.
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- Dynamical Systems Home Page - Mathematics Department, SUNY-Stony 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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- dynamical-systems.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 nine-point circle and Euler line, Fermat-Torricelli 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 plug-in.
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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; TI-92 calculator Cabri Geomètre materials. You may send for a 40-page 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 bachelors-level 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 González-Casanova
Analyses of ancient reckoning, a summation of Fermat's Last Theorem through simple addition and last-digit patterns, the Anti-Radian, 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 bee-line 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 NSF-sponsored 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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- EasyFit: Distribution-Fitting 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 high-quality 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 exam-style questions and model answers for ages 12-16; 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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- e-Calculus - 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 pop-up
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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 109-bit and other
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- EcEdWeb: Economic Education - Kim Sosin, Univ. of Nebraska at Omaha (UNO)
Teaching resources for economics teachers from K-12 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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