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A Disproof of Pythagoras' Theorem?  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.
A Primer on Cryptarithmetic  Instructions, examples, references and links.
Alphametics and Cryptarithms  Cryptarithms are puzzles in which letters or symbols are substituted for the digits in an arithmetical calculation. If a cryptarithm utilizes letters in place of the digits, and these letters form sensible words or phrases, the puzzle is termed an alphametic.
Back to Square One  Includes description, solutions and other resources on this cubelike puzzle.
Bamdad's Math Comics  Private collection of comics, cartoons and strips about math.
Bob's Positive Integer Pages  Various articles about positive integers, including an alternative number system that avoids the digit and number zero, a look at number systems and at the concept of zero.
Books and Articles on Mathematical Recreations  Information on list includes titles, authors, publishers and paperback or hardcover.
Challenging Mathematical Problems  Contains algebra, geometry, number theory, inequalities, Combinatorics, probability and analysis problems. Includes hints but no solutions.
Clever Games for Clever People  Games that interest John Conway including Rim and Traffic Jam.
Cryptarithms Online  70 brainteasers; a Primer on Cryptarithmetic; books and links to alphametics on the Web.
David Singmaster: List of Available Material  Teaching and recreational items in this personal collection.
Decimal to Hexadecimal Conversion  A table to convert any number from 1 to 255 to Hexadecimal.
EFF Cooperative Computing Awards  Cash prizes for discovery of very large prime numbers.
Ecker  Recreational & Educational Computing, Dr. Michael W. Ecker's Home Page  "REC gets better and better. I would not want to miss a single issue!" Martin Gardner, worldfamous recreational mathematics author
Eureka  The annual journal of the Archimedeans, the mathematical society of the University of Cambridge. It regularly contains articles on recreational mathematics.
Fair Dice  Contains a complete list of all possible Fair Dice, most of which are not cubes. Includes pictures.
Famous Curves Index  Curves you've heard of and curves you haven't, from Astroid to the Witch of Agnesi.
Fibonacci Numbers and the Golden section in Nature  Puzzles and things to do, for schools, teachers, colleges up to university level students, or just for recreation.
Fun With Mathematics  Includes pages on the topics of primes, fibonacci numbers, PI computation, data encryption and links to calculator programs.
Gardner Index  Rough index to the fifteen books containing Martin Gardner's Mathematical Games articles from Scientific American.
