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arXiv 2003.07832math.GR
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直角建筑泛群的拓扑和代数性质

Topological and algebraic properties of universal groups for right-angled buildings

Jens Bossaert, Tom De Medts

摘要:

我们研究直角建筑的通用群。受西蒙·史密斯关于树的泛群的工作的启发,我们明确地允许局部群不一定是有限的,也不一定是传递的。我们讨论各种拓扑和代数性质在此扩展设置。特别地,我们讨论了这类群是局部紧群,抽象单群,以及它们对建筑物的剩余群的作用,并讨论了这类群是紧生成群的一些充要条件.我们指出,有意想不到的方面有关的几何形状和这些建筑物的图,影响相应的通用群的拓扑和代数性质。

英文摘要:

We study universal groups for right-angled buildings. Inspired by Simon Smith's work on universal groups for trees, we explicitly allow local groups that are not necessarily finite nor transitive. We discuss various topological and algebraic properties in this extended setting. In particular, we characterise when these groups are locally compact, when they are abstractly simple, when they act primitively on residues of the building, and we discuss some necessary and sufficient conditions for the groups to be compactly generated. We point out that there are unexpected aspects related to the geometry and the diagram of these buildings that influence the topological and algebraic properties of the corresponding universal groups.

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