A Gathering of Gardner: Knotted Doughnuts and Other Mathematical Entertainments; Time Travel and Other Mathematical Bewilderments; Penrose Tiles to Trapdoor Ciphers... and the Return of Dr. Matrix
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$ 40.00
xii, 278; ix, 295; viii, 311 pp. An entertaining collection of puzzles and problems dealing with logic, fractals, negative numbers, topology, geometry, and other mathematical concepts and quandaries.