Mathematical Recreations and Essays Author:Walter William Rouse Ball 12 edition of classic work offers scores of stimulating, mind-expanding games and puzzles: arithmetical and geometrical problems, chessboard recreations, magic squares, map-coloring problems, cryptography and cryptanalysis, much more. "A must to add to your mathematics library"—The Mathematics Teacher. Index. References for Further ... more »Study. 150 black-and-white line illus.« less