- Recreational Mathematics (David Eppstein) - http://www.ics.uci.edu/~eppstein/recmath.html
- An extensive list of web resources for recreational math.
- A Disproof of Pythagoras' Theorem? - http://www.geocities.com/researchtriangle/system/8956/problems/pyth.htm
- A method of disproving the Theorem of Pythagoras is presented. The author is adamant that this is intended only as a puzzle to find the mistake in the arguments, and not as a serious proposal.
- Famous Curves Index - http://www-groups.dcs.st-and.ac.uk/~history/curves/curves.html
- Curves you've heard of and curves you haven't, from Astroid to the Witch of Agnesi.
- Mathematics Museum (Japan) - http://mathmuse.sci.ibaraki.ac.jp/indexe.html
- At Mathematics Museum (Japan) you would be surprised how interesting mathematics is. You will find exhibition rooms produced by Japanese researchers and educators.
- Mathematical Quotation Server - http://math.furman.edu/~mwoodard/mqs/mquot.shtml
- Furman University Mathematical Quotation Server - random or searchable math quotes.
- Table of Numbers Problem - http://www.alpertron.com.ar/cuadro.htm
- Given a m * n rectangle, place all numbers from 1 to mn that minimizes the sum of the products of rows and columns (both in Spanish and English).
- The Sound of Mathematics - http://www.geocities.com/vienna/9349/
- Algorithmic music determined by mathematics and by the musical preferences of a human. General MIDI files.
- Iamond - http://www.mathpuzzle.com/iamond.htm
- A page on polyiamond puzzles. Includes many pages on tessellation.
- Roman Numerals - http://www.novaroma.org/via_romana/numbers.html
- Includes a introduction to Roman numerals including a translation of the digits used and a converter which can convert decimal to Roman numerals and vice versa.
- The Aesthetics of Symmetry - http://home.earthlink.net/~jdc24/symmetry.htm
- A brief digression into how people perceive symmetrical patterns -- what makes them boring, interesting, or overly intricate
- MAA Library List in Recreational Mathematics - http://www.maa.org/bll/recmath.htm
- Book list split into categories. Includes title, author, publisher and date information about each book.
- Math in the Movies - http://world.std.com/~reinhold/mathmovies.html
- A guide to major motion pictures with scenes of real mathematics.
- Wade Edward Philpott - http://www.gamepuzzles.com/wade.htm
- Profile and description of his mathematical games and puzzles.
- Sir Roger Penrose - http://www.worldofescher.com/misc/penrose.html
- An article about him and his interests and contributions to recreational mathematics.
- Mudd Math Fun Facts - http://www.math.hmc.edu/funfacts/
- An archive of interesting math facts for use in the classroom or just for fun. Browse by subject, difficulty, keywords, or try the "random" feature. Based at Harvey Mudd College.
- Fair Dice - http://www.mathpuzzle.com/fairdice.htm
- Includes a complete list of all possible Fair Dice, most of which are not cubes. Includes pictures.
- Geometric Packing Problems - http://www.york.cuny.edu/~malk/tidbits/tidbit-geometric-packing.html
- By Joseph Malkevitch: "Given one shape X how and when can one pack identical copies of this shape into another shape Y?"
- Mathematik - http://www.mathematik.com/
- Individual pages on different topics in Mathematics. Examples : group theory, dynamical systems theory, geometry or number theory.
- Mathematical Diversions - http://members.aol.com/s6sj7gt/mikehome.htm
- Mostly original diversions in mathematics and word play.
- Recreational Mathematics - http://camel.math.ca/recreation/recreation.html
- Links collected at CAMEL, the Canadian Mathematical Society website.
- MAT 007 I News - http://www.math.toronto.edu/007/
- A newsletter edited by undergraduates of the Department of Mathematics at the University of Toronto. Includes some online copies.
- Recreational and Educational Computing - http://members.aol.com/drmwecker/rec.html
- A newsletter with programs, including optional supplemental PC disk. All back issues are available. Topics include puzzles and teasers, BASIC programming, letters, graphics, fractals, challenges, recreation, reviews, word-play, humor, tips, solutions, and Mathemagical Black Holes.
- Properties of Dice - http://hjem.get2net.dk/klaudius/dice.htm
- Polyhedral dice and their properties.
- Cryptarithms Online - http://www.geocities.com/athens/agora/2160/
- 70 brain-teasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web.
- Rubik's Cube Lecture Notes - http://web.usna.navy.mil/~wdj/rubik_nts.htm
- Notes on the mathematics of the Rubik's cube.
- HAKMEM - http://www.inwap.com/pdp10/hbaker/hakmem/hakmem.html
- A collection of problems from MIT. Work reported herein was conducted at the Artificial Intelligence Laboratory, a Massachusetts Institute of Technology research program.
- David Singmaster: List of Available Material - http://anduin.eldar.org/~problemi/singmast/material.html
- Teaching and recreational items in this personal collection.
- Gardner Index - http://www.ms.uky.edu/~lee/ma502/gardner5/gardner5.html
- Rough index to the fifteen books containing Martin Gardner's Mathematical Games articles from Scientific American.
- Narcissistic Numbers - http://www.geocities.com/~harveyh/narciss.htm
- Those that are representable, in some way, by mathematically manipulating the digits of the numbers themselves.
- Recreational Mathematics Topics - http://www.uwgb.edu/dutchs/recmath/recmath.htm
- By Steven Dutch. Symmetry, Crystals, Polyhedra and Tilings; Pythagorean triplets and other things about sums of powers; Geometry Classics.
- Mathematical Quotation Server - http://math.furman.edu/~mwoodard/mquot.html
- A collection of mathematical quotations culled from many sources. You may conduct a keyword search through the quotation database.
- Mathematics in Art and Architecture - http://www.math.nus.edu.sg/aslaksen/teaching/math-art-arch.shtml
- An interdisciplinary course on mathematics in art and architecture.
- Maze Classification and Algorithms - http://www.astrolog.org/labyrnth/algrithm.htm
- A short description of mazes and how to create them. Definition of different mazetypes and their algorithms.
- Jlpe's Number Recreations Page - http://www.geocities.com/windmill96/numrecreations.html
- Features original number recreations by the author, such as generalized perfect numbers, digital diversions, diophantine equations, didactic numbers, and number theory.
- Skytopia - Super Magnet - http://www.skytopia.com/project/magnet/magnet.html
- A colourful world built entirely using mathematical atoms and molecules. Pictures and animations demonstrate structures colliding and interacting. Animated GIF demonstrations.
- Spirocharts - http://www.nehuenmultimedia.com.ar/html/spirograph.html
- A windows application that creates mathematically precise spirograph drawings; savable as images.
- Sportlab - http://www.geocities.com/sportlab/
- Combines high school and college math topics into sports applications.
- Number Recreations by Shyam Sunder Gupta - http://www.shyamsundergupta.com/
- Features interesting facts about different numbers. Includes favorite related links.
- Look and Say Sequence Generator - http://www.btinternet.com/~se16/js/looknsay.htm
- Creates a special kind of summation formula created by John Conway.
- One Metaphor Fits All - http://www.btinternet.com/~se16/mhi/
- Explains Conway's audioactive decay that is generated by a particular kind of sequence. Includes illustrations and related resources.
- Back to Square One - http://www.geocities.com/jaapsch/puzzles/square1.htm
- Includes description, solutions and other resources on this cube-like puzzle.
- Fibonacci numbers and the Pascal triangle - http://milan.milanovic.org/math/
- The relation between Fibonacci numbers and Pascal's triangle. English/German/Serbian.
- Mathematische Basteleien - http://www.mathematische-basteleien.de/
- Topics include Flexagon, Soma Cube, Pentominos, Cube-it, Rubik's Cube, Froebel's Star, Tangram, House of Santa Claus, Chronogram, Numeric Palindromes, Latticework of Letters. English/German.
- Mathmos - http://www.mathmos.net/
- Includes puzzles, jokes, quotations, poetry, and FAQs.
- CuriousMath - http://www.curiousmath.com/
- Include news, math tricks, methods, facts, trivia, mostly posted by users.
- Famous Curves - http://www.geocities.com/famouscurves/
- Visual animations of famous curves.
- Math Magic By Computer - http://www.cut-the-knot.org/curriculum/index.shtml#magic
- Interactive java puzzles and activities in different mathematical topics.
- Math Forum: 2001 Mathematics Game - http://mathforum.org/~judyann/2001/
- A contest that asks to write all integers from 1 to 100 using only the digits 2,0,0,1 and arithmetic operations.
- Math Forum: 2002 Mathematics Game - http://mathforum.org/~judyann/2002/
- A contest where the contestants have to write all integers from 1 to 100 using only the digits 2,0,0,2 and arithmetic operations.
- Mathematical Problems - Problem Solving - http://mathres.kevius.com/problem.html
- Mathematics Hots (Problems) by Bruno Kevius
- Math Forum: Algebra Problem of the Week - http://mathforum.org/algpow/
- View this week's algebra problem or those of previous weeks.
- Mathematical Induction - http://www.math.cl/induction.html
- A page of uncommon problems, most closely connected with number theory.
- Fun With Mathematics - http://www.geocities.com/hjsmithh/
- Includes pages on the topics of primes, fibonacci numbers, PI computation, data encryption and links to calculator programs.
- Final Answers - http://home.att.net/~numericana/answer/
- Numerous facts including formulas, magic tricks, fallacies, recreations compiled by Dr. Gerald P. Michon.
- SimonSingh.net - http://www.simonsingh.net/
- Home of Simon Singh: author, journalist and TV producer, specialising in science and mathematics. Cryptography is one of his specialties, and his site has a lot of educational and fun content about codes and codebreaking.
- Mathematical Lego Sculptures - http://www.andrewlipson.com/mathlego.htm
- Designed and built by Andrew Lipson. Images and LDraw files.
- Recmath - http://www3.sympatico.ca/diharper/
- Includes pages on magic squares and polyomino patterns and contains related java applets.
- Mathematical Fiction - http://math.cofc.edu/faculty/kasman/mathfict/
- A list of mathematical fictional movies, books, stories, plays and shows. Split into categories including children's books. Can be sorted by mathematical content and literary quality.
- The Nine Digits Page - http://www.worldofnumbers.com/ninedig1.htm
- Puzzles and problems connected with numbers using the digits 1-9.
- Who Can Name the Bigger Number? - http://www.scottaaronson.com/writings/bignumbers.html
- An essay by Scott Aaronson on the quest for ever-bigger numbers, from exponentials to Busy Beavers.
- How To Manually Find A Square Root - http://math.arizona.edu/~kerl/doc/square-root.html
- The way to do find a square root without a calculator.
- Eureka - http://www.archim.org.uk/eureka/
- The annual journal of the Archimedeans, the mathematical society of the University of Cambridge. It regularly contains articles on recreational mathematics.
- Origami Mathematics - http://www.merrimack.edu/~thull/origamimath.html
- Information on the mathematics of paper folding.
- On the Puzzles with Polyhedra and Numbers - http://gfm.cii.fc.ul.pt/people/jrezende/jr_poliedros-puzzles_en.pdf
- This is an article on a set of didactical games edited by the Portuguese Mathematical Society (SPM).
- Amazing Spiro - http://cgibin.erols.com/ziring/cgi-bin/spiro.pl/spiro.html
- An applet for making spirograph graphs. Includes options for size, color and shape. Allows saving of completed image.
- A Mathematician's Aesthetics - http://finitegeometry.org/sc/ph/aesthetics.html
- In his classic A Mathematician's Apology, G. H. Hardy likened mathematics to poetry and painting. This site elaborates on Hardy's remark with quotations from Stevens, Klee, Fry, and Focillon. Links to related sites are given.
- Stunning Friends with Math Magic - http://www.cut-the-knot.org/arithmetic/rapid/magic.shtml
- A collection of card tricks, number guessing games, paper and glue magic, and other math exercises.
- Fast Arithmetic Tips - http://www.cut-the-knot.org/arithmetic/rapid/
- Three categories: defensive - know to check an answer, offensive - fast mental calculations, and math magic.
- The Diamond 16 Puzzle - http://finitegeometry.org/sc/16/puzzle/
- New version of the classic puzzle using row/column/quadrant permutations to display symmetries of graphic designs. Has link to a site on the underlying mathematics (Diamond Theory).
- Mathematical Spectrum - http://www.apt.group.shef.ac.uk/ms.html
- Mathematical Spectrum is a magazine for students and teachers of mathematics in universities, colleges and schools worldwide. It may be read by anybody interested in mathematics as a recreation.
- The Eugène Strens Recreational Mathematics Collection - http://www.ucalgary.ca/lib-old/speccoll/strens.htm
- A special collection at the University of Calgary, including the archives of Martin Gardner. There is a searchable online index.
- Critical Math - http://www.gwywyr.com/articles/scimaths/
- Articles and images on recreational math from fractals and magic squares to mathemorchids and Galois.
- Eric's Scientific Book List: Recreational Mathematics - http://www.ericweisstein.com/encyclopedias/books/recreationalmathematics.html
- Book list from Eric Weisstein including titles, authors, publishers, prices, page count and some have links to Amazon.com.
- Recreational Mathematics Forum - http://forums.delphiforums.com/recmath/
- A forum for posting messages about math recreations. Hosted at Delphi.
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