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arXiv 1002.4320math.GRmath.GT
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$\tilde C_n$型Artin-Tits群的Garside表示

A Garside presentation for Artin-Tits groups of type $\tilde C_n$

François Digne

摘要:

证明了$\tilde C$型的Artin-Tits群是Garside幺半群的分数群,类似于已知的与球面型Artin-Tits群相关的对偶幺半群,并通过“生成群”方法得到。在这种特殊情况下,这回答了关于Artin-Tits群的一个一般性问题,给出了$\tilde C$型Artin-Tits群的一个新表示,并对字问题、某些中心化子的计算或中心的平凡性产生了影响。证明的一个关键点是证明这个群是在一个对合下的$\tilde A$型Artin-Tits群中的不动点群。另一个重要的一点是研究通常的辫群的Hurwitz作用对Coxeter元素分解成反射的产物的影响。

英文摘要:

We prove that an Artin-Tits group of type $\tilde C$ is the group of fractions of a Garside monoid, analogous to the known dual monoids associated with Artin-Tits groups of spherical type and obtained by the "generated group" method. This answers, in this particular case, a general question on Artin-Tits groups, gives a new presentation of an Artin-Tits group of type $\tilde C$, and has consequences for the word problem, the computation of some centralizers or the triviality of the center. A key point of the proof is to show that this group is a group of fixed points in an Artin-Tits group of type $\tilde A$ under an involution. Another important point is the study of the Hurwitz action of the usual braid group on the decomposition of a Coxeter element into a product of reflections.

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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