A program for running them may be downloaded from John Walker and Rudy Rucker s site. For a general reference to mathematical and science subjects, try this huge compilation of links and facts by Eric Weisstein and his Treasure Troves. The Infinite Fractal Loop above is just one of many such groups of subject related sites on the net. Webring have a comprehensive index of them, and there is a search engine on their front page - use a general rather than a specific keyword. 2. a place for entering, such as a door or gate.
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