Maximally Symmetric Trees |
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Authors: | Lee Mosher Michah Sageev Kevin Whyte |
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Affiliation: | (1) Department of Mathematics, Rutgers University, Newark, NJ, 07102, U.S.A;(2) Department of Mathematics, Technion, Israel University of Technology, Haifa, 32000, Israel;(3) Department of Mathematics, University of Chicago, 5734 S. University Ave., Chicago, IL, 60637, U.S.A. |
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Abstract: | We characterize the best model geometries for the class of virtually free groups, and we show that there is a countable infinity of distinct best model geometries in an appropriate sense – these are the maximally symmetric trees. The first theorem gives several equivalent conditions on a bounded valence, cocompact tree T without valence 1 vertices saying that T is maximally symmetric. The second theorem gives general constructions for maximally symmetric trees, showing for instance that every virtually free group has a maximally symmetric tree for a model geometry. |
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Keywords: | virtually free groups maximally symmetric trees |
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