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Science 24 December 2004:
Vol. 306. no. 5705, pp. 2182 - 2183
DOI: 10.1126/science.306.5705.2182
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GEOMETRIC TOPOLOGY:
Taming the Hyperbolic Jungle by Pruning Its Unruly Edges

Dana Mackenzie

Answering decades-old questions, two new theorems set limits on how wild some universes can get.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)