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arXiv math/0607351math.CO
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图的Kazhdan性质(T)

Kazhdan's Property (T) for Graphs

Clara Brasseur, Ryan E. Grady, Stratos Prassidis

摘要:

D. A. Kahzdan在研究有限余体积的李群的离散子群时首次提出了性质(T)。通过组合的方法,我们定义了正则图的性质(T)的一个类似物。然后,我们证明了基本的组合和度量性质的Kazhdan群在这方面。特别是,我们使用我们的方法来构建无限家庭的扩展在经典的情况下。最后,我们考虑了群论性质$(τ)$的组合类比,并证明了它的基本性质。

英文摘要:

D. A. Kahzdan first put forth property (T) in relation to the study of discrete subgroups of Lie groups of finite co-volume. Through a combinatorial approach, we define an analogue of property (T) for regular graphs. We then prove the basic combinatorial and metric properties of Kazhdan groups in this context. In particular, we use our methods to construct infinite families of expanders as in the classical case. Finally, we consider the combinatorial analogue of the group theoretic property $(τ)$ and prove its basic properties.

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