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arXiv 0707.0487math.GTmath.GR
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$z$ -双曲空间的等距类

$z$-Classes of Isometries of The Hyperbolic Space

Krishnendu Gongopadhyay, Ravi S. Kulkarni

摘要:

设$G$是一个群。如果两个元素$x, y$的中心化子在$G$中共轭,则称它们为{ \it $z$ -等价}。$G$的类方程是将$G$划分为共轭类。共轭类进一步分解为$z$ -类提供了关于群内部结构的重要信息。设$I(\H^n)$表示双曲$n$ -空间的等距群。证明了$I(\H^n)$中$z$类的个数是有限的.我们实际上计算了它们的数量,参见。定理1.3.我们将$z$类的有限性解释为$I(\H^n)$中“动态类型”的有限性。在此过程中,我们还参数化共轭类。为此,我们主要使用双曲空间的线性模型。这种参数化共轭类的描述似乎是新的。

英文摘要:

Let $G$ be a group. Two elements $x, y$ are said to be {\it $z$-equivalent} if their centralizers are conjugate in $G$. The class equation of $G$ is the partition of $G$ into conjugacy classes. Further decomposition of conjugacy classes into $z$-classes provides an important information about the internal structure of the group. Let $I(\H^n)$ denote the group of isometries of the hyperbolic $n$-space. We show that the number of $z$-classes in $I(\H^n)$ is finite. We actually compute their number, cf. theorem 1.3. We interpret the finiteness of $z$-classes as accounting for the finiteness of "dynamical types" in $I(\H^n)$. Along the way we also parametrize conjugacy classes. We mainly use the linear model for the hyperbolic space for this purpose. This description of parametrizing conjugacy classes appears to be new.

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