双曲空间中的Poincaré平分线
Poincaré Bisectors in Hyperbolic Spaces
摘要:
本文给出了在双曲二、三空间中构造Dirichlet基本区的平分线的显式公式。他们进行了比较,等距领域的建设中采用的福特域,并用于找到一个有限集的发电机的离散群体的有限covolume。应用于富克斯群、Kleinian群,包括Bianchi群,以及有限幂零群的整群环的单位群的生成元的有限集的构造。给出了一个易于实现的算法DAFC,并将其用于离散群生成元的搜索。
英文摘要:
We determine explicit formulas for the bisectors used in constructing a Dirichlet fundamental domain in hyperbolic two and three space. They are compared with the isometric spheres employed in the construction of a Ford domain and used to find a finite set of generators for discrete groups of finite covolume. Applications are given to Fuchsian groups, Kleinian groups, including the Bianchi groups, and for the construction of a finite set of generators of the unit group of the integral group ring of a finite nilpotent group. An easy implementable algorithm, DAFC, is also given and used in the search for generators of discrete groups.
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