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arXiv math/0603204math.GTmath.GR
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纯辫群的几何表示

Geometric presentations for the pure braid group

Dan Margalit, Jon McCammond

摘要:

给出了纯辫群的几个新的正有限表示,这些表示形式简单,便于记忆。我们所有的演示文稿都涉及穿刺盘上的度量,以便穿刺被安排为“凸”,这就是为什么我们将它们描述为几何presentaitons。出于我们称之为“旋转演示”的完整辫群的演示,我们介绍了我们称之为“扭曲演示”和“摆动演示”的纯辫群的演示。从映射类群的角度来看,摆动表示可以解释为:纯辫群由有限个德恩扭曲生成,唯一需要的关系是不相交关系和灯笼关系。

英文摘要:

We give several new positive finite presentations for the pure braid group that are easy to remember and simple in form. All of our presentations involve a metric on the punctured disc so that the punctures are arranged "convexly", which is why we describe them as geometric presentaitons. Motivated by a presentation for the full braid group that we call the "rotation presentation", we introduce presentations for the pure braid group that we call the "twist presentation" and the "swing presentation". From the point of view of mapping class groups, the swing presentation can be interpreted as stating that the pure braid group is generated by a finite number of Dehn twists and that the only relations needed are the disjointness relation and the lantern relation.

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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