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arXiv 1604.07375math.GRmath.DS
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拟isometry的动力学特征及其在上同调中的应用

Dynamic characterizations of quasi-isometry, and applications to cohomology

Xin Li

摘要:

通过建立粗等价和连续轨道等价之间的字典,在几何群论和拓扑动力系统之间架起了一座桥梁。作为应用,我们对Shalom和Sauer关于同调维数和上同调维数的粗不变性以及Shalom的性质$H_{FD}$给出了概念上的解释.作为另一个应用,我们证明了一类系数的群同调和上同调,包括所有诱导模和上诱导模,是粗糙不变量。我们推出的是类型的$FP_n$(在任意环)是一个粗糙的不变量,并作为一个(庞加莱)对偶群在一个环是一个粗糙的不变量之间的所有群体有有限的上同调维数的环。我们的结果还意味着任何环上的Poincaré对偶群的每一个自粗嵌入必须是粗等价的。

英文摘要:

We build a bridge between geometric group theory and topological dynamical systems by establishing a dictionary between coarse equivalence and continuous orbit equivalence. As an application, we give conceptual explanations for previous results of Shalom and Sauer on coarse invariance of homological and cohomological dimensions and Shalom's property $H_{FD}$. As another application, we show that group homology and cohomology in a class of coefficients, including all induced and co-induced modules, are coarse invariants. We deduce that being of type $FP_n$ (over arbitrary rings) is a coarse invariant, and that being a (Poincaré) duality group over a ring is a coarse invariant among all groups which have finite cohomological dimension over that ring. Our results also imply that every self coarse embedding of a Poincaré duality group over an arbitrary ring must be a coarse equivalence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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