Wikipedia Talk:Aperiodic tiling

Help rewrite

The third and fourth facts, which are proved in Gruenbaum and Shephard
and asserted in the Martin Gardner columns, contradicts several
statements about periodicity in the article.  But I haven't time to
edit it now.  I hope these concepts will help whoever does work with
the article, and that they look up the extent to which these apply to
Amman and other aperiodic tilings.  -Dan Hoey 01:27, 24 April 2007 (UTC)