Groups acting on cubes and Kazhdan’s property (T)

Groups acting on cubes and Kazhdan’s property (T)
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作用于立方体和 Kazhdan 财产的团体 (T)

DOI:
10.1090/s0002-9939-98-04463-3
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发表时间:
1998
影响因子:
1.4
通讯作者:
M. Roller
M. Roller
中科院分区:
数学2区
文献类型:
--
作者:
Graham A. Niblo;M. Roller

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本文证明了群G包含子群K,其中e(G,K)> 1当且仅当它允许一个作用在连通立方体上,且该作用在超平面上传递且没有不动点。作为推论,我们推出具有这样一个子群的可数群G不满足Kazhdan性质(T)。
We show that a group G contains a subgroup K with e(G,K) > 1 if and only if it admits an action on a connected cube that is transitive on the hyperplanes and has no fixed point. As a corollary we deduce that a countable group Gwith such a subgroup does not satisfy Kazhdan's property (T).