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arXiv 1209.5804math.GR
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真CAT(0)立方复形上的抛物作用

A parabolic action on a proper, CAT(0) cube complex

Yael Algom-Kfir, Bronislaw Wajnryb, Pawel Witowicz

摘要:

我们考虑图群定义的V.Guba和M。萨皮尔一个图群G通过等距作用在相应的立方复形K上。已知如果立方复形L是有限维的,则L的每个等距g是半单的,即它的平移长度是实的。它是由D. S. Farley指出,在图群G的情况下,G对相关立方复形K的作用是半单等距的,即使K具有无穷维。本文给出了Farley猜想的一个反例,证明了R。汤普森群F,被认为是一个图群,有一些元素在相关的立方复形上充当抛物线(不是半单)等距。

英文摘要:

We consider diagram groups as defined by V. Guba and M. Sapir. A diagram group G acts on the associated cube complex K by isometries. It is known that if a cube complex L is of a finite dimension then every isometry g of L is semi-simple, i.e. its translation length is realized. It was conjectured by D. S. Farley that in the case of a diagram group G the action of G on the associated cube complex K is by semisimple isometries even when K has an infinite dimension. In this paper we give a counterexample to Farley Conjecture and we show that R. Thompson's group F, considered as a diagram group, has some elements which act as parabolic (not semi-simple) isometries on the associated cube complex.

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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