Textbook in PDF format

The history of mathematics is replete with examples of major breakthroughs resulting from the solutions to recreational problems. The modern theory of probability arose out of problems of concern to gamblers, for example, and modern combinatorics grew out of various games and puzzles. Despite this track record and a wealth of popular-level books, research in recreational mathematics has often been neglected. The Mathematics of Various Entertaining Subjects remedies this situation and returns with an all-new third volume, presenting further research into diverse areas of recreational mathematics.
This third volume focuses on four areas: puzzles and brainteasers, games, algebra and number theory, and geometry and topology. Among the many topics, readers will create Spiral Galaxies (Japanese symmetric grid puzzles consisting of squares and circles) whose solutions are letters and numbers, delve into a paradox in the game of Bingo, examine the card tricks of mathematician-philosopher Charles Sanders Peirce, and learn about the mathematics behind Legos.
Elucidating the many connections between mathematics and games, The Mathematics of Various Entertaining Subjects is sure to challenge and inspire mathematicians and math enthusiasts