 Interactive Nim  Bryan Clair, University of Chicago
The interactive Nim page. A twoplayer game  you versus the computer. On your move, you can 'take' any number of 'o's from a single row, by deleting them. You may not pass. To win, you must take the last 'o' left in the game, or equivalently leave the
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 Internet Math Challenge  Dept. of Mathematics, University of Idaho
A weekly K12 math challenge from the math department at the University of Idaho, discontinued in 2004. Past puzzles and solutions are available.
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 Introducing Mathematics
This website looks at some areas of mathematics that are not familiar to most people, such as Ramsey theory and set theory, but introduces them in an uncomplicated manner.
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 An Introduction to Kolmogorov Complexity and Its Applications  Li, Vigányi
2nd edition textbook on the subject, which can be ordered through the Web. A postscript file of contents is also available. The incompressibility method and Kolmogorov complexity is a versatile mathematical tool, a sharper relative of classical information
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 Invitation to MasterMind  Cut the Knot!, Alexander Bogomolny, with Don Greenwell
Mastermind is a game played by a codemaker and a codebreaker. The codemaker selects a code, a sequence of four colors (digits, pegs or other symbols) chosen from a set of six colors (repetitions allowed). The codebreaker will then try to guess the code.
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 IQFlash.com  Sergey Melnikov
Logic and math games include a variation of Nim, Rhumb Line (similar to tictactoe), and Breakfast Brainstorm (rotate the pans in order to make each of the four numbers equal 20 as soon as possible). Strategy articles include games such as tictactoe,
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 Ira M. Gessel
This is a list of Ira Gessel's recent papers in combinatorics. Most of them must be downloaded in pdf, .dvi, or gzipped PostScript formats.
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 Jaap's Scratch Pad  Jaap Scherphuis
Java applets, generators, and solutions for sudoku, Rubik's Cube, "moving pieces" puzzles, permutation puzzles, and more, including sphere symmetries, polyform, Towers of Hanoi, and many lesser known puzzles from this collector. Scherphuis' articles range
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 James Propp
James Propp studies tilings, games, and other aspects of combinatorics, probability, and dynamical systems. Many of his articles are available for download in PostScript and gzipped PostScript formats. Code for C programs related to tilings and cellular
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 Japanese Centre for Combinatorics and its Applications  Ryoh FujiHara; University of Tsukuba
Links to conference information, journals, information resources, related organizations, and home pages of combinatorial people.
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 Java Applets for Statistics  Shangrong Deng, Kai Qian, and XuYan Chen
A collection of applets that do calculations and provide illustrations for topics in elementary statistics: the sample space model, calculator (mean and deviation), multiplication rule for counting, permutations and combinations, tossing a balanced coin
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 Jeffrey C. Lagarias
A member of the University of Michigan Department of Mathematics. List of publications, with many available for download in PostScript format; Lagarias' research interests include Number Theory, also Computational Complexity Theory, Cryptography, Discrete
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 John Stembridge
John Stembridge researches algebra and combinatorics. His papers on these subjects are available online as gzipped PostScript files. The site contains an archive of related research data such as lists of posets on 8 or fewer vertices and Coxeter graph
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 Jon McCammond
A mathematician at Texas A&M University. Research interests include geometric group theory and lowdimensional topology, as well as combinatorics, graph theory, and computational geometry. Preprints can be downloaded in PostScript format. Current
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 Journal of Algebra (Academic Press)  Harcourt, Inc.
The Journal of Algebra presents carefully selected articles concerning original research in the field of algebra. Articles from related research areas that have a significant bearing on algebra are also included. Topics covered include: Structure of finite
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 Journal of Algebraic Combinatorics  Kluwer Online
The journal publishes papers in which combinatorics and algebra interact in a significant and interesting fashion. This interaction might occur through the study of combinatorial structures using algebraic methods, or the application of combinatorial
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 Journal of Combinatorial Designs  John Wiley & Sons, Inc.
An international journal devoted to the timely publication of the most influential papers in the area of combinatorial design theory.
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 Journal of Combinatorial Theory  Series A (Academic Press)  Harcourt, Inc.
The journal publishes original mathematical research concerned with theoretical and physical aspects of the study of finite and discrete structures in all branches of science. Series A is concerned primarily with structures, designs, and applications
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 Journal of Difference Equations and Applications
This journal presents papers on difference equations and the academic, analytical and engineering problems in which they arise. The journal is composed of original research, expository and review articles, as well as papers that present new concepts in
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 Journal of Integer Sequences  Jeffrey O. Shallit, editorinchief
This is an electronic journal devoted to papers dealing with integer sequences and related topics. All papers are available as html documents.
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 K12 Math Problems, Puzzles, Tips & Tricks  Math Forum
Links to calculation tips (Beat the Calculator, Divisibility Rules, Multiplication Tips), Math Problem sets, and math number and line puzzles.
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 K12 Teaching Materials (Mathematics Archives)  University of Tennessee, Knoxville (UTK)
An extensive list of Internet sites with significant collections of materials that can be used in the teaching of mathematics at the K12 level. Organized into categories: lesson plans, schools, software and other K12 Internet math sites.
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 KAMDIMATIA Series  Helena Nyklova, Editor
The KAM Series (Discrete Mathematics  Combinatorics  Operations Research  Optimization) serves as a prepublication medium for the scientific output of the Department of Applied Mathematics of the Faculty of Mathematics and Physics at the Charles University
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 Karla Hoffman
A specialist in operations research and combinatorial optimization. Papers in PDF, PostScript, or HTML formats include articles on airline scheduling, set covering, and the traveling salesman problem. Resume and curriculum vitae and syllabus, project,
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 Knight Coverings for Large Chessboards  Frank Rubin
Knight coverings for square chessboards up to 26x26, and proofs of optimality for boards up to 10x10. The problem of how to cover a chessboard with the smallest number of knights has fascinated mathematicians and chess players for years. The problem is
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 Kumar Jeev's Research  Kumar Jeev
Articles in PDF format, PowerPoint presentations, C++ code, and abstracts. Includes "Symbolic Stochastic Systems and the Matrix Tree Theorem," with JeanLouis Lassez, in which an alternative proof for the Matrix Tree Chain theorem, proven by Tom Leighton
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 Laurent Habsieger
A research associate at Laboratoire Algorithmique Arithmétique Expérimentale, Laurent Habsieger studies analytic number theory, coding theory, and combinatorics. Some articles on these topics are available for download in PostScript format.
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 Lectures on Probability, Statistics and Econometrics  Marco Taboga
Lectures and exercises on probability theory, statistics, and econometrics. The section entitled "mathematical tools" provides overviews and examples of combinatorics (permutations, dispositions, combinations), sequences, limit of a sequence, the RiemannStieltjes
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 Let's Play Math!  Denise Gaskins
"As a homeschool mom who loves math, I want to help other homeschoolers see the variety and richness of the subject.... I hope this blog will be a place where we can play around with ideas about learning, teaching, and understanding math. (For me, it
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 MAA Bookstore  Mathematical Association of America
A searchable list of books, with descriptions, in the following categories: Algebra; Analysis; Applied Mathematics; Calculus; Career Information; Computing and Computers; Elementary Models; Games, Puzzles, and Popular Exposition; Geometry and Topology;
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 Magic Cards  Chunsheng Ban
You see four cards, each with eight numbers. Think of a number from 1 to 15; Check ALL the boxes below the cards that contain your number; Click on the button "What's My Number?"; Your number will be displayed on the screen. Based on an exercise in a
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 The Magma Computational Algebra System  Computational Algebra Group, University of Sydney
A system designed by the Computational Algebra Group, headed by Dr J. J. Cannon, in the School of Mathematics and Statistics at the University of Sydney, to solve computationally hard problems in algebra, number theory, geometry and combinatorics. Magma
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 Magnus: A System for Exploring Infinite Groups  New York Group Theory Cooperative, CCNY
A free, intuitive, graphically driven objectoriented package for computational group theory, exploring infinite groups. From the New York Group Theory Cooperative at CCNY, which also provides links to an archive of preprints and open problems in combinatorial
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 Mancala Web  Brian Casey, Imagiware, Inc.
An ancient, challenging game. Mancala is played with seven pits  six playing pits plus one score pit, the Kalaha, per player. At the beginning of the game, each of the (12) playing pits contains 3 seeds (or beads or stones or balls or whatever). To play,
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 The Mathematical Atlas: A Gateway to Modern Mathematics  Dave Rusin
A collection of short articles introducing the subject areas of modern mathematics, describing a few of the milestone results and topics, and giving pointers to some of the key resources where further information is to be found. The material is arranged
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 Mathematical BBS (Mathematics)  Mathematics Dept., Univ. of Ferrara, Italy
Collections of resources: Associations, Departments, Disciplines, Journals, Industrial mathematics, the mathematician. Disciplines include: Algebra; Algebraic geometry; Analysis; Applied Mathematics; Categories; Combinatorics; Complex analysis; Computational
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 Mathematical Circles Topics  Tom Davis
Mathematical Circles are for students of high school age or younger who want to increase their abilities to reason about mathematical problems. Students who study in circles learn to do mathematical olympiadstyle problems (essay or proofs, not quick
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 Mathematical Entertainment  Eric Hiob, British Columbia Institute of Technology
Instructions for building a pinball table that demonstrates Pascal's Triangle. Also, notes on the Travelling Salesman Problem; Finding Areas Using the Monte Carlo Method; Important Numbers (pi and e); the Inside or Outside Problem; and the Roller Coaster
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 Mathematical Problems  Torsten Sillke
Some in German, most in English. Topics include graph theory, number theory, combinatorics (enumerations), geometry, algorithms and complexity, recreational mathematics, tiling and packing, dissections, probability, algebra, analysis. Also links to "MathNews"
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 A Mathematica Package for Studying Posets  Curtis Greene, Haverford College
Download Macintosh, Windows, or ASCII versions of posets22d, a Mathematica package for generating, displaying, and exploring partially ordered sets (also known as "posets"), with an emphasis on combinatorics. The package can generate a poset directly
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 Mathematics and Statistics: Academic Press  Elsevier
This imprint of Elsevier offers over 100 print and eBook titles in mathematics and statistics.
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 Mathematics Archives  University of Tennessee, Knoxville (UTK)
A comprehensive site for finding mathematics on the Internet; particularly strong in its collection of educational software and links to other sites of interest to mathematicians that provide access to electronic journals, preprint services, grant information,
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 Mathematics by Somos  Michael Somos
A mathematician at Cleveland State University and the originator of Somos Polynomials and the Somos Sequence. Brief discussions of these objects, as well as rational triangles and Pythagorean triples, may be found on this site along with links to resources
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 Mathematics Graphics Gallery  Xah Lee
A collection of mathematical images. Links to files on Xah Lee's sites that contain attractive mathematics graphics: Nested Inversion of Circles; Conic Sections; Epicycloid and Hypocycloids; Rose Curves; wallpaper designs; Transformation of the Plane;
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 Mathematics Illuminated  Annenberg Media
A video course for adult learners, high school and college teachers; 13 halfhour video programs, online text, course guide, and Web site; graduate credit available. "Rather than a series of problems to be solved, mathematics is presented as play we engage
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 Mathematics Journals (AMS)  American Mathematical Society
A list of mathematics journals with articles on the Web and a list of Web sites for printed journals, with tables of contents of issues, abstracts of papers, actual papers, information about submissions and subscriptions, etc. See also the Annual Listing
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 Mathematics Journals: Electronic and Printed  Mathematics Dept., Penn State University
Links to dozens of journals, from the Academic press electronic journal library to the Ulam Quarterly, and spanning printed journals from Abstract and Applied Analysis to the Zentralblatt für Mathematik. A link to the Bibliothèque Mathématique
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 Mathematics  World Lecture Hall
Links to pages created by faculty worldwide who are using the Web to deliver math class materials: course syllabi, assignments, lecture notes, exams, class calendars, multimedia textbooks, etc. Advanced Integer Programming, Advanced Linear Programming,
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 Math Exercises
Interactive exercises, lessons, and worksheets to practice knowledge of whole numbers, integers, divisibility, fractions, exponents and powers, percentages, proportional reasoning, linear equations, quadratic equations, monomials, polynomials, special
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 Math Pages  Kevin Brown
A collection of over 600 brief articles covering a huge variety of mathematical topics. Contents include: Number Theory; Combinatorics; Geometry; Algebra; Calculus and Differential Equations; Probability and Statistics; Set Theory and Foundations; History
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