- The Fractal Murders - Mark Cohen
A witty mystery that follows private eye Pepper Keane as he seeks to learn what connects the seemingly unrelated deaths of three math professors -- all specialists in fractal geometry. Originally published by Muddy Gap Press, and re-released by Mysterious
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- Franklin's Mathematics - Paul C. Pasles, Villanova University
From the author of Benjamin Franklin's Numbers: articles on the founding father's "little-known role as a mathematician," and examples of Franklin's magic squares and magic circle.
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- The Free Fall Research Page - Green Harbor Publications
Accounts of people who "have survived a fall of thousands of feet without a working parachute." In particular, learn facts about "falling math" -- how to calculate terminal velocity -- and download the Free Fall Research Page Speed Conversion Table, which
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- Friedman Numbers - Erich Friedman
A Friedman number is a number that can be written in some non-trivial way using its digits, the operations + - * / ^ and concatenation of digits. For example, 25 and 126 are Friedman numbers, since 25 = 5^2, and 126 = 6 * 21. Page includes a list of all
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- Fritz Dooley's Mancala Center - Fritz Dooley
Game theory analysis of the board game Mancala, written as a research paper for Harvard Business School.
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- Futility Closet - Greg Ross
"An idler's miscellany of compendious amusements." Math posts, which date back to January, 2005, have included puzzles, curios, and trivia from the lives of famous mathematicians -- all "self-contained and written as concisely as possible" -- such as
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- GalaxyGoo
An interdisciplinary, volunteer thinktank dedicated to exploring expressions of science and math with online technologies, for public benefit. Read interviews of scientists; explore math such as the sine curve with Flash, participate in forums and blogs,
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- Gene Abrams
Beamer files for seminars and colloquia on Leavitt path algebras, and activities related to mad veterinarian puzzles": "The Graph Menagerie: Abstract Algebra meets the Mad Veterinarian"; "The Graph Menagerie: Abstract algebra and the Mad Veterinarian"
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- Geometry Playground - Exploratorium
An exhibit from San Francisco's Exploratorium. People-sized exhibits let you use your hands, brain, and body to play with physical demonstrations of geometry concepts. Exhibits fall under the categories of seeing, moving, and fitting things together,
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- Giant Fractal Pecan Pie
The creators of this tutorial explain that they wanted to figure out how to design a large pie that still strikes a balance between the filling (area) and the crust (perimeter). View the steps they took to construct a very enormous pecan pie in the shape
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- God's Number is 20 - Tomas Rokicki
An outline explaining how every Rubik's Cube™ permutation can be solved in twenty moves or fewer, established algorithmically by machine proof in July, 2010. Read "How did we solve all 43,252,003,274,489,856,000 positions of the cube?" and "What
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- Googol Learning - Susan Jarema
"It wasn't until I began teaching my own children math and had to relearn it that I began to see its beauty...." From the family publishers of the Discovery Multiplication Program, music such as "Multiplication Vacation," and other educational DVDs, games,
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- Grand Illusions - Hendrik Ball
A "site for the enquiring mind, with optical illusions, scientific toys, visual effects, and even a little magic." Includes a number of feature articles on vision, photography, mirrors, optical toys, movies, etc. See, in particular, the geometrical optical
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- Great Maths Teaching Ideas - Will Emeny
Emeny's blog of teaching ideas and resources, which dates back to June, 2010, has included posts such as "Investigating the sum of interior angles in polygons," "Can you make practising the times tables fun? Yes, just give me three dice," "When angles
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- Greg Egan's Home Page
Information, illustrations, and Java applets that supplement some of the works of the science fiction author. The Applets Gallery includes groups of rotations in three dimensions and in four dimensions; Escher, inspired by the artist's conflicting orientation
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- Gregory Buck - The New Yorker
"Like everyone else I know, when I go to the beach I think mathematics....I have had people ask me what it is like to do research in mathematics, and perhaps the answer is that it is like a snowstorm...." Seasonal posts by the Saint Anselm College professor
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- The Grothendieck Biography Project - Ferment Magazine
The on-going translation of Alexandre Grothendieck's Récoltes et Semailles into English.
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- The Hadamard Maximal Determinant Problem - Will Orrick, Bruce Solomon
The site lists the largest known determinants of {-1,1} matrices. It also has links to other online
sources of large determinant matrices and references to the literature.
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- Hard Problems - George Paul Csicsery, and the Mathematical Association of America (MAA)
Hard Problems is a feature documentary about the students who represented the United States at the 2006 International Mathematical Olympiad (IMO). The film shows the dedication and perseverance of the six American high school students, the rigorous preparation
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- Harvard Sports Analysis Collective
Dedicated to the quantitative analysis of sports strategy and management, this Harvard student organization focuses on the intersection of sports, sports business, statistics, and problem solving. Original analysis and research into sports analytics authored
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- HASTAC Initiative - Humanities, Arts, Science, and Technology Advanced Collaboratory
HASTAC ("haystack") is a network of individuals and institutions inspired by the possibilities that new technologies offer us for shaping how we learn, teach, communicate, create, and organize our local and global communities. HASTAC is open to anyone;
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- helaman ferguson sculpture - Helaman Ferguson
A mathematician sculptor whose stone and bronze artworks include "Aperiodic Penrose," the Coons Siggraph award, "Esker Trefoil Torus," "Fibonacci Fountain," "Fibonacci Tetrahedron," "Figureeight Knot," "Eine Kleine Link Musik," "Torus with Cross-Cap,"
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- Henry Segerman's webpages - Henry Segerman
Mathematical and typographical art "of various kinds and dimensions." See, in particular, Segerman's 3D printed sculpture, book covers and posters, diamond Go, ambigrams, autologlyphs, autological words, Escher's Printgallery, and math-art t-shirts available
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- HitTrackerOnline - Greg Rybarczyk
Hit Tracker "determines the true distance a home run travels by recreating the precise trajectory the ball followed during flight, and extending that trajectory all the way back to field level to allow 'measurement' of the home run." Hit Tracker's spreadsheet
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- How to Solve a Rubik's Cube Guide for Beginners - John Wade
An illustrated guide to solving Rubik's cube in seven steps.
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- Impossible World - Vlad Alexeev
About impossible figures in art. These figures can be painted on paper but cannot be represented in space. There are many artworks by M.C. Escher, Jos de Mey, Sandro del Prete and many other artists. Also, you can view animations and read articles about
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- Information is Beautiful - David McCandless
Compelling graphic presentations on health supplements, plane accidents by final destination, government spending, time travel in popular film and TV, and many other "facts, data, ideas, subjects, issues, statistics, and questions" -- all with the minimum
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- Interactive Math - Christopher Henrich
Topics in recreational mathematics, including polyhedra, kaleidoscopes, magic squares, and trochoids, presented with interactive applets.
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- International Slide Rule Museum - Mike Konshak
Scans and pictures of over 1000 unique actual slide rules. Search the gallery, or browse it by manufacturer. Also, learn how to use a slide rule, and determine its date. With terms, encyclopedia, manuals, a graphical table of slide rule scales, and more.
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- International Snow Sculpture Championships: Team Minnesota - Department of Mathematics and Computer Science, Macalester College
Team Minnesota's Enneper surface entry earned second place in the Breckenridge International Snow Sculpture Championships of 2000. The site also includes photos of their planning, design, and implementation stages, the acceptance speech, and the team's
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- International String Figure Association (ISFA)
The ISFA site introduces "String figures" (designs formed from nothing more than a loop of string), with instructions on how to become a member of ISFA and information on e-mail discussion groups and international gatherings, and links to related sites.
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- Internet Problem Solving Contest - Faculty of Mathematics, Physics and Informatics, Comenius University, Slovak Republic
The Internet Problem Solving Contest (IPSC) is a computer programming contest for teams consisting of up to three people. Teams participate via the Internet. Each problem consists of a problem description and two input data sets. Questions tend towards
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- Intriguing Tessellations - Marjorie Rice
Famous for discovering four hitherto unknown tilings of pentagons, Marjorie Rice got her start in tessellations reading an article by Martin Gardner. This site features mathematical explanations and examples of several tessellations using pentagons, as
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- Isabel's Math Blog - Isabel Catherine Lugo
A log of "interesting mathematics-related things" found on the web. The author studies mathematics at MIT, and since April of 2004 has used the blog to "... talk about interesting mathematics I come up with myself -- mostly toy problems, but I might even
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- Japanese Temari - Barb Seuss
Read about the history of this Asian needlework craft, find free patterns to stitch your own geometric designs on the sphere, browse online galleries of temari, and more.
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- Java Jive - Martin J. Chlond
A Game of NIM, Games Coins Play (NIM-like coin games), Kayles (remove coins), Space-Time Maze (a 4-D maze puzzle), Northcott's Game (played on a chessboard), Corner the Queen, CGT Chess (played on a 6-by-8 checkerboard), and 5 X 5 and Lights on (each
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- Journal of Recreational Mathematics - Joseph S. Madachy, Editor Emeritus
A journal devoted to the lighter side of mathematics, featuring games, puzzles, and articles that challenge the mental agility of everyone who enjoys the intricacies of mathematics. Edited by Charles Ashbacher and Lamarr Widmer.
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- Justin Mullins
High resolution photography of famous math formulas, available for purchase as posters and limited edition prints.
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- K-12 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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- Kakuro Puzzles - JAKRO Soft LLC
Free printable crossword puzzles that use sums instead of spellings, offered at difficulty levels of easy, medium, hard, and "evil." See also JAKRO's apps and page of tips for solving kakuro.
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- Keith Numbers - Mike Keith
Alphametics (also known as alphametrics) are puzzles that combine mathematical and word play, the first modern example of which was Dudeney's SEND + MORE = MONEY. From the "alphamenu," choose traditional alphametics, the doubly-true genre, new literary
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- KenKen - Nextoy, LLC
KenKen is a sudoku variant invented by Japanese mathematics teacher Tetsuya Miyamoto. This site offers puzzles at various levels of difficulty to get you started, as well as rules, tips, news, related products, and KenKen programs for your mobile device.
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- KenKen @ the Math Forum - Nextoy, LLC and the Math Forum @ Drexel
A collection of KenKen puzzles ranging in size from 3x3 to 9x9, at four difficulty levels, with many combinations of arithmetic operations. The site offers an introduction to KenKen, lesson plans, rules, discussion, and tutorial. KenKen is a number puzzle
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- Kids Math Games Online - Rene Smith
Free interactive games on addition, counting, division, geometry, money, multiplication, number (including mean median mode), problem solving (bridge crossing, hourglass time, wolf and sheep), and subtraction. Logic games include a 3D puzzle cube, Mastermind,
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- The King of Infinite Space: Donald Coxeter, The Man Who Saved Geometry - Siobhan Roberts
As a companion to The King of Infinite Space, a biography of Donald Coxeter, this website provides photographs, archives, papers, video footage, links and other resources, allowing readers to further explore Donald Coxeter’s infinite passion for geometry.
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- The Knight's Tour - Dan Thomasson
The Knight's Tour web site shows various ways to solve open and closed knight tours. The site also offers several animated tours, artwork, and new concepts (magic squares, tessellations, and conjectures about prime numbers) derived from knight moves on
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- KrazyDad.com - Jim Bumgardner
Printable puzzles, mazes, games, and more from a self-described "senior nerd" at Disney Interactive Labs: kakuro (aka cross sums, numeric crossword puzzles), krypto kakuro (a combination of kakuro and cryptograms), slitherlink, bridges (aka Hashiwokakero),
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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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- Lewis Carroll - Jerry Stratton
"Lewis Carroll's work is often disneyfied for children, but when read raw is complex and fascinating...." Full texts and illustrations by Carroll, aka Charles Lutwidge Dodgson: Alice's Adventures Everywhere, Alice's Adventures Underground, Alice's Adventures
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- LiveCube.com - Min Shih
A puzzle-building system: small colored cubes may be joined to create larger assemblies. Site includes puzzle models, discussion areas for puzzle designers and educators, and a catalog of puzzle components for purchase. Requires several plugins; files
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