 24 Theory
This "hobby website" offers JavaScript that calculates, enumerates, and displays all distinct solutions and solvable scenarios to the popular arithmetic card game, as well as interactive tables. 24theory.com also provides an online version of the 24 game
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 3DMathematikprogramm  Ingenieurbüro Riescher
German shareware program for Windows: MATHPROF ist ein einfach bedienbares Mathematikprogramm mit graphischen 2D und 3DDarstellungen, für Schüler, Studenten und Lehrer. Auch lassen sich einfache Konstruktionen im 2D und 3DBereich erstellen und analysieren.
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 Aaron Robertson
Aaron Robertson researches combinatorics, specifically Ramsey Theory. Abstracts of his papers are available online, and they may be downloaded in LaTeX, .dvi, PostScript, or PDF format. Related Maple packages, for which the code is available online,
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 The Accidental Mathematician  Izabella Laba
Blog about "mathematics, academia, gender, and more" by a professor of mathematics at the University of British Columbia. Posts, which date back to October, 2007, have included "Women in Math, or Sisters Are Doing It for Themselves"; "The trouble with
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 Akalu Tefera's Electronic Headquarters  Department of Mathematics and Statistics, Grand Valley State University
A mathematician whose research interests include computer algebra, automated theorem proving, and combinatorics and their "derivatives" or "equivalence classes." The site contains Maple packages for multiple integration of hyperexponential functions.
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 Algebraic Combinatorics Via Finite Group Actions  A. Betten, H. Fripertinger, A. Kerber
An Internet book with chapters on Actions: Actions of Groups; Bilateral classes, symmetry classes of mappings; Finite symmetric groups; Complete monomial groups; Enumeration of symmetry classes; The involution principle; and Special symmetry classes;
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 Algorithms and Ice Cream For All (MegaMath)  Nancy Casey; Los Alamos National Laboratory
Solve a city planning problem using mathematical graphs and algorithms. Students use algebraic methods to explore, model, and describe patterns and functions involving numbers, shapes, data, and graphs in problemsolving situations and communicate the
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 Algorithms Project  Institut National de Recherche en Informatique et en Automatique (INRIA)
A small international group of people with interests in design and analysis of algorithms, computer algebra, combinatorial analysis and asymptotics. It aims at general methods in combinatorics and analysis, with which classes of problems can be treated
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 Alien Tiles Official Web Page  Pickover and Mckechnie
A difficult puzzle developed by Dr. Cliff Pickover and Cam Mckechnie. (Some have called it Rubik's cube for the new millennium.) The rules are simple, but the patterns soon become very complex. The authors look forward to hearing from artists, puzzle
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 alt.math.undergrad  Math Forum
An unmoderated discussion forum for issues and problems pertaining to college undergraduate mathematics. Read and search archived messages; and register to post to the discussions.
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 Andrew Odlyzko
Home page of the Head of the Mathematics and Cryptography Research Department at AT&T Labs. The site contains a comprehensive list of his papers, most of which may be downloaded in LaTex, PDF, or PostScript form if they are not available as plain
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 Anna Stokke
Teaching, research, and other activities of the cofounder of the nonprofit Archimedes Math Schools and of the advocacy group WISE Math. See, in particular, the "advocacy & math education" tab for the mathematics professor's editorials and interviews
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 Applied Combinatorics Environment (ACE)
Documentation and FTP sites for the Applied Combinatorics Environment, or ACE, a group of programs for MAPLE to aid in combinatorics research.
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 Arbeitsgruppe Bachem/Schrader  University of Köln
A working group of the Center for Parallel Computing (ZPR) at Köln. Site includes a list of members and contact address; informative writeups on its projects, some in English. Topics include: Basic Research (meaning "pure" as opposed to "applied");
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 Arbelos Internet Math Society  Bert Liberi and William F. Widulski, Westchester Communtiy College
A mathematics society dedicated to the pursuit of elegance in problemsolving. Every month, solve challenging problems that require "more imagination than memorization." Also, access old problems and solutions; and study a list of heuristics of problemsolving,
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 Around the Dartboard  Ivars Peterson (MathLand)
The numbers on a standard dartboard have the following order, going clockwise starting at the top: 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7, 16, 8, 11, 14, 9, 15, and 5. Why this particular order? A possible criterion for designing a dartboard is
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 arXiv.org ePrint archive  Los Alamos National Laboratory (LANL)
A major site for mathematics preprints that has incorporated many formerly independent specialist archives including alggeom, functan, dgga, qalg, autofms, cdhg, MAGNUS, Several Complex Variables, Logic Eprints, Commutative Algebra, Dynamical Systems,
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 The Australasian Journal of Combinatorics  The Combinatorial Mathematics Society of Australasia, Inc.
A triannual publication of the Combinatorial Mathematics Society of Australasia (CMSA). Search across all of the journal's volumes for authors or keywords in article titles; browse tables of contents dating back to the March, 1990, issue. Also, learn
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 Aviezri Fraenkel
Aviezri Fraenkel is an Israeli mathematician investigating combinatorial game theory. This page offers preprints and recent reprints in postscript format; a comprehensive bibliography on combinatorial games; and links to information on conferences and
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 The Awari Oracle  John Romein
Play the ancient African "count and capture" strategy board game, related to mancala, and also known as wari, awale, oware, or ayo. Dutch computer scientists from Amsterdam's Vrije Universiteit developed a program that computes the best move and eventual
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 Behind the Numbers  Jonathan Sills; ESPN SportsZone
A monthly column that explores the gray area between math and sports and what happens when exact calculations meet the human, unpredictable factors that make sports so entertaining. A combinatoric and probabilistic analysis of changes in World Cup soccer
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 Bell Package  Jacek Kisynski
This package provides functions which are useful while dealing with set
partitions. We provide (hopefully) fast methods for sets of size up to 15
and methods with no set size restrictions which use BigInteger objects. The
later ones are constrained
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 The Boise Problem Book  Marion Scheepers; Dept. of Mathematics, Boise State University, Boise, ID
Combinatorial games and set theory. Chapters include: Covering games and Memory; Peculiar sets of real numbers and games; Gdelta properties and games; The precipitous ideal game; Cardinal numbers related to the real line; Embedding problems; Gaps; The
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 Books: Professional & Technical: Professional Science: Mathematics  Amazon.com
Browse bestselling math books from the Professional and Technical Bookstore at Amazon.com, in such categories as Applied; Chaos & Systems; Geometry & Topology; Mathematical Analysis; Mathematical Physics; Number Systems; Pure Mathematics; Transformations;
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 Brendan McKay
Software includes nauty, a program for computing automorphism groups of graphs and digraphs, which can also produce a canonical labelling; and plantri, a program for generating planar triangulations. Also, skeptical treatment of claims made of miraculous
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 Brief Course Materials for Various Courses  E. Lee Lady; University of Hawaii
A collection of short handouts: files are in PDF and DVI formats. Contents include: The Fundamental Theorem of Arithmetic, the division algorithm, solutions of linear congruences, solving the Chinese Remainder problem, an example of a continued fraction,
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 Brilliant
Weekly Olympiadstyle challenges that offer "rigorous, competitive, whimsical, and edifying" problem sets in math and physics. Register to explore the Brilliant Techniques Trainer's practice exercises; answer correctly to earn points redeemable for lanyards,
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 British Combinatorial Committee  Peter Cameron, Chair
A body that works for the support of combinatorial and discrete mathematics in the United Kingdom. Conferences in 2000 and 2001; Bulletin and information; News Items; links to related sites.
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 CADCOM: Committee for the Advancement of Discrete and Combinatorial Mathematics  Chris Rodger, Auburn University, USA (Chair)
An international committee formed by the Institute for Combinatorics and its Applications (ICA) to present Combinatorics and Discrete Mathematics in its best light to all interested people and agencies, including university administrations, industry,
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 Calculators OnLine Center: Part II  Mathematics  Martindale's Reference Desk
Over 7,420 calculators for: Unit Conversion (Time, Distance, Length, Speed, Weight, etc.); Abacus; Basic Math; Complex Mathematics; Complex Math Education; Complex Math Calculators by Specialty: Algebra and Linear Algebra; Algorithms; Calculus; Central
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 Card Games  John McLeod
Rules and information, including probabilities, about card and tile games. Indices by alphabetical order, classified by mechanism and by objective (including a list of children's games), arranged by country and the types of cards. Also, commercial, solitaire,
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 Catalogue of Lattices  Neil Sloane, Gabriele Nebe
A catalogue of different types of lattices, combinatorial objects with direct applications to packing spheres into a limited amount of space.
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 Categories and Combinatorics Group  Mathematics and Statistics, Univ. of Sydney, Australia
Category theory is a recent branch of mathematics originating in algebraic topology, but rapidly establishing connections with algebra, logic, algebraic and differential geometry, and most recently computer science. Category theory is particularly suited
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 CATS: Combinatorial Algorithms Test Sets  ACM Journal of Experimental Algorithmics (JEA)
Mission: to facilitate experimental research by standardizing common benchmarks, providing a mechanism for their evolution, making them easily accessible and usable, and identifying significant open questions in the design of good test sets and the assessment
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 CO Combinatorics (Front for the Mathematics ArXiv)  Univ. of California, Davis
Combinatorics 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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 CombinaTexas: Combinatorics in the SouthCentral U.S.  Texas A&M University
Web pages for conferences, with contact information.
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 Combinatorial Figures  Robert M. Dickau; Math Forum
Mathematica pictures that are interesting for elementary combinatorics. Catalan number diagrams; permutation diagrams; derangements; shortestpath diagrams; Stirling numbers of the first and second kind; Bell numbers, harmonic numbers and the bookstacking
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 Combinatorial Games  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A collection of interactive combinatorial games, many implemented in both normal and misère versions, including by Kayles, Nimble, and Northcott; variants of Nim, such as Wythoff's Nim; OnePile and TakeAway games; a subtraction game, a fraction
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 Combinatorial Games Page  Erik Demaine
A combinatorial game usually involves complete information, with no hidden cards and no random randomness  a pure strategy game. Demaine has researched combinatorial puzzles such as Tetris, Clobber, Phutball, Pushing blocks (puzzles involving a robot
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 Combinatorial Game Theory  David Eppstein, Theory Group, ICS, UC Irvine
A list of links to materials on the Web. Combinatorial Game Theory studies strategies and mathematics of twoplayer games of perfect knowledge such as chess or go (but often either concentrating instead on simpler games such as nim, or solving endgames
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 Combinatorial Geometry (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material consisting of problems in which one starts with a geometric figure (say a polytope) but then considers abstract incidence properties of it rather than its metric properties. Most tiling and coloring problems
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 Combinatorial Mathematics Society of Australasia (CMSA)
Information for members of a society formed to facilitate, encourage, foster and cherish the branch of mathematics known as combinatorics throughout Australia, New Zealand and their neighbouring countries. Rules; members; minutes of meetings; annual general
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 Combinatorica  János Bolyai Mathematical Society, SpringerVerlag
An international journal that publishes research papers in English in a variety of areas of combinatorics and the theory of computing, with particular emphasis on general techniques and unifying principles.
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 Combinatorics and Graph Theory  Department of Mathematics, Umeå University, Sweden
Home page of the Combinatorics Group. Members and research projects, seminars, archives of downloadable software, combinatorial and graph theoretical data, and preprints.
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 Combinatorics (Graphics Archive, Special Topics)  The Geometry Center
Enumeration problems, and other problems involving counting, including meanders.
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 Combinatorics, Probability & Computing  Cambridge University Press
Now published bimonthly, the journal covers combinatorics, probability theory, and theoretical computer science. Topics covered include classical and algebraic graph theory, extremal set theory, matroid theory, probabilistic methods and random combinatorial
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 Combinatorics Research Group  Pure Maths Department, The Open University
A group interested in graph theory, design theory, the history of combinatorics, and combinatorial computing. The Group runs the Open University Winter Combinatorics Meeting near the end of January each year.
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 Combinatorists of New England
A series of oneday conferences mostly held at Smith College in Northampton, MA. The Combinatorists of New England meet five times a year. This Web site provides information about future meetings and links to participants' papers available electronically.
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 Computational Complexity (CC)  Birkhäuser Verlag AG, Switzerland
CC presents outstanding research in computational complexity. Its subject is at the interface between mathematics and theoretical computer science, with a clear mathematical profile and strictly mathematical format. You may download a free electronic
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 Covering Systems, Restricted Sumsets, Zerosum Problems and Their Unification  ZhiWei Sun
Three famous topics in combinatorial number theory and a unified theory of them.
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