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arXiv 0810.3926math.GR
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高维Thompson群的度量性质

Metric properties of higher-dimensional Thompson's groups

Jose Burillo, Sean Cleary

摘要:

高维Thompson群nV是Brin所描述的双表示群,它将单位区间上的并矢自映射推广到n维单位立方体上的并矢自映射。我们描述了一些度量性质的高维汤普森群。我们给描述的元素的树对图的基础上,并给出上,下界的字长的大小方面的图。虽然这些上限和下界有些分离,我们表明,有实现的下界的元素和接近的上界收敛到1的元素的分数,显示的界限是最佳的,一般实现的上界。

英文摘要:

Higher-dimensional Thompson's groups nV are finitely presented groups described by Brin which generalize dyadic self-maps of the unit interval to dyadic self-maps of n-dimensional unit cubes. We describe some of the metric properties of higher-dimensional Thompson's groups. We give descriptions of elements based upon tree-pair diagrams and give upper and lower bounds for word length in terms of the size of the diagrams. Though these upper and lower bounds are somewhat separated, we show that there are elements realizing the lower bounds and that the fraction of elements which are close to the upper bound converges to 1, showing that the bounds are optimal and that the upper bound is generically achieved.

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