Talk:Domino problem
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Should add some stuff about the Heesch and Isohedral numbers, and the Period Problem; why this implies there exist an infinity of methods of construction aperiodic sets of tiles, and there are proofless aperiodic sets, and the new (as yet unpublished) results of Margenstern and Kari.--C Goodman-Strauss 22:09, 6 October 2007 (UTC)