 OptNet  Michael Jünger; SIGOPT, Deutsche Mathematiker Vereinigung (DMV)
An electronic forum for the optimization community organized by SIGOPT under the auspices of the Deutsche Mathematiker Vereinigung (DMV). The basic services are a weekly digest containing a moderated list of contributions, a unique email address and
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 Orbifold Pinball  Yevgeniy Dodis; The Geometry Center
A game in which you roll a ball on an unusual playing field. The game board is like ordinary pinball in that it features 'bumpers' off which the ball can bounce. But in this game, the board is 'curved' in such a way that a ball barely missing the bumper
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 The Orbifold Shop (Geometry and the Imagination)  Conway, Doyle, Gilman, Thurston; The Geometry Center
A symmetry project: the Orbifold Shop offers a free coupon for $2.00 worth of parts, installation included, to anyone acquiring a new orbifold. There are only a few kinds of features for twodimensional orbifolds, but they can be used in combinations:
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 Orbit Research
Developers and manufacturers of Orion Talking Scientific calculators the TI84 Plus and the TI36X, the iBill Talking Banknote Identifier, and other "products that enable an independent lifestyle for the physically challenged"  the visually impaired
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 Orbits and Gravitation  MacTutor Math History Archives
A hypertext essay covering Copernicus through Poincaré, LeviCivita, and Birkhoff, with References.
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 Order  Kluwer Online
A journal on the theory of ordered sets and its applications. Order occurs throughout mathematics and especially in algebra, combinatorics, geometry, model theory, set theory and topology.
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 Order, Lattices, Ordered Algebraic Structures  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to ordered sets. Ordered sets, or lattices, give a uniform structure to, for example, the set of subfields of a field. Various special types of lattices have particularly nice structure and have applications
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 Ordinary Differential Equations  Dave Rusin; The Mathematical Atlas
A short article designed to provide an introduction to ordinary differential equations, equations to be solved in which the unknown element is a function rather than a number, and in which the known information relates that function to its derivatives.
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 Ordinary Differential Equations for Reliability, Maintainability and Availability  Harry A. Watson; Math Forum
A public domain textbook on ordinary differential equations, freely available online, by Harry A. Watson, a mathematician with the U.S. Naval Warfare Assessment Station. The entire document is available in DVI and TEX format on the Math Forum server;
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 Ordinary Differential Equations Project  Blanchard, Devaney, Hall; Boston University
This project included the development of a textbook (publisher Brooks/Cole Publishing Co.) as well as various workshops on teaching differential equations. Instructors manuals and selected articles are available from this site: "Teaching Differential
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 O'Reilly  O'Reilly & Associates, Inc.
Computer books, software, and online publishing. Search the O'Reilly catalogue for concepts and keywords having to do with mathematics. Bookstores, conferences, software, how to order, contacts, affiliated companies.
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 The Organic Mathematics Project  Centre for Experimental and Constructive Mathematics (CECM)
A collaborative research project involving a number of researchers at the Centre for Experimental and Constructive Mathematics (CECM). Involves in part the development of WWWbased and Mapleassisted tools for document annotation and math activation.
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 Organic Mathematics Workshop: The Proceedings  Borwein, Borwein, Corless, Jörgenson, Sinclair, eds.
Proceedings of a 1996 workshop held at Simon Fraser University, Vancouver, Canada. Speakers (top experimental and computational mathematicians); their articles, with equations, code, photos, videos, and annotations; and related resources and links. Invited
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 Orig4mi  Jorge C. Lucero
Origami na ciência, tecnologia e design. Desde outubro, 2008, este profesor da Universidade de Brasília tem escrito neste blog artigos diversos sobre origami, inclusive abrigos dobráveis de bambu, origami com moléculas de DNA,
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 Origami Mathematics  Tom Hull
Information on origami and the mathematics of paper folding. With an origami math bibliography and pictures and tutorials in origami geometric construction, as well as links to other origami sites and events.
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 Origami Page  Joseph Wu
Origami is the art of paper folding. The word is Japanese, literally meaning "to fold" (oru) "paper" (kami). Links to photo galleries, information on origami, files and diagrams, other origami home pages, and areas related to origami (A paper on Molecular
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 Origami (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on the Japanese art of paper folding, obviously geometrical in nature. Some origami masters have looked at constructing geometric figures such as regular polyhedra from paper. In the other
direction, some
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 Original Lesson Plans  Mathematics  Thirteen/WNET New York
Original Webbased activities developed by Thirteen Ed Online Master Teachers. Each lesson consists of an overview with learning objectives, procedures for teachers, and "organizers" for students  handouts, bibliographies, and other materials. Math
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 Orlando Sessions: Math Education Reform  Math Forum
The 1996 Joint Mathematics Meetings in Orlando, Florida featured presentations on math education reform.
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 Orlando Sessions on Interdisciplinary Math
The 1996 Joint Mathematics Meetings in Orlando, Florida featured presentations on interdisciplinary programs.
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 Orlando Sessions on PreService Teacher Ed  Math Forum
The 1996 Joint Mathematics Meetings in Orlando, Florida featured presentations on "Creating an Active Learning Environment  Preparing PreService
Teachers."
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 ORLibrary  J. E. Beasley; Imperial College of Science, Medicine and Technology
A collection of test data sets for a variety of Operations Research (OR) problems, available via emailing to o.rlibrary@ic.ac.uk a message containing the name of the required file, or via FTP/WWW using the links provided. Also at http://mscmga.ms.ic.ac.uk/info.html.
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 OR/MS Today
Online version of the magazine for members of the Institute for Operations Research and the Management Sciences (INFORMS). Current and previous issues, with full text of many articles; subscription information; software surveys; classified ads and list
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 ORNotes  J. E. Beasley
Introductory originally used in an introductory OR course at Imperial College. Topics: Introductory (basic concepts); Deterministic (data envelopment analysis, facility layout and location, graph theory, integer programming, inventory control, justintime,
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 Orthocenter  Paul Kunkel
What is significant about the orthocenter of a triangle? Why does it even have a name? This investigation was prepared for a geometry teachers' workshop. It includes a lesson handout in Word format and was written for use in a computer lab with the Geometer's
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 Oscience.info  Subash Chandra
Introductions to limits and continuity, derivatives and antiderivatives, functions and graphs, matrices and determinants, properties of triangles, set theory, basic trigonometric formulae, and trigonometric functions and identities. See also Oscience's
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 Other Maths  Jon Perry
Notes, applets, and proofs on a variety of open problems and conjectures: roots of x^p, highest power of 2 that divides ab + bc + ca, a prime product paradox, consecutive integers, (n + 1)!, Collatz, nsecting a line, the first lower digit, Fibonacci,
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 The OU Calculus I Problem Archive  Dept. of Mathematics, Oklahoma University (OU)
Sample problems, with hints, answers, and "the grisly details": 1. Functions, calculus style; Graphs; Machine graphics; What is a function?; A field guide to elementary functions. 2. Amount functions and rate functions; The geometry of derivatives; The
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 The Oughtred Society  Oughtred
An organization dedicated to the history and collection of slide rules. Meet William Oughtred, inventor of the modern slide rule; learn about the history and background of the Oughtred Society and its principles; join or renew membership; browse tables
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 Overcoming Greatness: The Decline and Recovery of British Mathematics in the PostNewton Era  Robert Bruen; Harvard University
An historical essay on Newton and Leibniz, British Progress, European Progress, and the story of the overthrow of Newton's notation at Cambridge. Includes a bibliography.
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 Overthinking My Teaching  Christopher Danielson
Blog by a community college math teacher "interested in hard questions about teaching." Posts, which date back to July, 2009, have included "Wump hats," "An unnoticed rule for number language," "The end of word problems," "Cubeyness," "Cardinal and ordinal
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 An overview of Babylonian mathematics  MacTutor Math History Archives
Linked essay exploring the arithmetic and geometry of the Babylonians, who lived in Mesopotamia, a fertile plain between the Tigris and Euphrates rivers. The Babylonian civilization replaced the Sumerian civilisation and the Akkadian civilisation; this
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 An overview of Egyptian mathematics  MacTutor Math History Archives
Linked essay on the development of the Egyptian number systems, and the arithmetical methods they devised to work with their numerals. With references and other related web sites.
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 An overview of Indian mathematics  MacTutor Math History Archives
Linked essay on the contributions of Indian mathematics, in particular the number system invented by the Indians, on which much of mathematical development has rested. With references and other related web sites.
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 Overview of "Mathematician's Secret Room"  Hisanori Mishima
Challenges to unsolved problems in Number Theory, some translated into English from the Japanese.
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 Overview of the History of Mathematics  MacTutor Math History Archives
Linked overview from the Babylonians through topics from the twentieth century, with additional sections on notation and communication, brilliant discoveries, how we view history, and a challenge, as well as a 700item general bibliography.
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 Oxford University Press
The world's largest university press, publishing 3,000 new books a year, including scholarly works in all academic disciplines, bibles, music, school and college textbooks, children's books, materials for teaching English as a second language, business
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 OzGrid Business Applications  Dave Hawley
Focus on Microsoft Excel and Spreadsheet applications, with over 4000 pages (and growing) of information. Newsletter, most popular productgs, templates, books, question and answer forum.
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 Pacific Institute for the Mathematical Sciences (PIMS)
A networked institute based in Alberta and British Columbia, Canada. Primarily dedicated to the support and advancement of mathematical science in Western Canada and the Pacific Rim, it maintains physical offices at the Universities of Alberta, British
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 Packomania  E. Specht
The best known packings of equal circles in the unit square and the unit circle. Tables summarize the current status of the search. Figures may be downloaded in postscript format. Also available from http://hydra.nat.unimagdeburg.de/packing/packing.html.
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 Pagina de Pedro Hugo Garcia Pelaez  Pedro Hugo Garcia Pelaez
Pagina con diversas calculadoras fisicas y matematicas. Apuntes y links relacionados. Calculadoras: Programa de resolución de multiplicación de matrices hasta orden 6; Forma de Jordan; Calculadora de diagonalización; Calculadora de proyecciones; Calculadora
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 Paginedimatematica  Bruno Tomaino
In Italian: Analisi, trigonometria, equazioni differenziali, test a risposta multipla.
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 Palindromic Numbers and Other Recreational Topics  Patrick De Geest
Many odd facts about big (and little) numbers, including circular primes and palindromic triangulars, tetrahedrals, squares, cubes, and primes. Also assorted odd puzzles, etc.
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 Palindromic Primes  Ivars Peterson (MathTrek)
Palindromic primes are whole numbers, evenly divisible only by themselves and 1, that also have the same sequence of digits read forward or backward... The current record for the largest known palindromic prime is held by Harvey Dubner, a retired electrical
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 Palisade
Software for Excel, including @RISK, using Monte Carlo simulation, and PrecisionTree, for risk analysis, decision analysis, optimization, and forecasting.
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 PAM Electronic Discussion List (PAMnet)  Parker Ladwig and Thurston Miller (list owners)
An electronic discussion forum for the discussion of library and information resource issues relevant to the fields of physics, astronomy and mathematics, maintained by the PhysicsAstronomyMathematics (PAM) Division of the Special Libraries Association.
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 Panagiotis Stefanides
Geometry presented at national conferences in Greece. Contents include: Quantization of Circle Duality; Logos Pyr Chronos; 'Buena Fortuna' (artwork); Geometric Mean Ratio (T) by Ruler and Compass; Quadrature Master Theorem; Corollary (Circle Circumference
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 Panitz cooperative learning and WAC web page and much more  Ted Panitz, Cape Cod Community College
Workshops, articles, and other resources on cooperative learning and pedagogy.
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 PaperFoldingFractals  Joel Castellanos, Rice University
A classroom teaching or personal learning software tool for Windows that can be an introductory lesson to fractals. Simple, stepbystep processes of paper folding can give rise to infinite verities of fractals. The user learns what fractals are and how
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 Paper Models of Polyhedra  Gijs Korthals Altes
Dozens of paper models of polyhedra: Platonic and Archimedean solids, compounds, caleidocyli, and more. Print the images, cut, and glue them together, or download the models in zipped CorelDraw or GIF format.
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