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arXiv 0909.5511math.GT
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图辫群的Abrams稳定等价

Abrams's stable equivalence for graph braid groups

Paul Prue, Travis Scrimshaw

摘要:

在他的博士论文中,Abrams证明了,对于一个自然数n和一个至少有n个顶点的图G,G的形变收缩核的n股配置空间收缩到一个紧的子空间,即离散化的n股配置空间,只要G满足两个条件:不同基本顶点之间的每条路径(顶点的次数不等于2)的长度至少为n+1条边,并且从顶点到其自身的不是零同伦的每条路径的长度至少为n+1条边。利用Forman的CW-复形的离散莫尔斯理论,我们证明了第一个条件可以放宽到只要求不同的基本顶点之间的每条路径的长度至少为n-1。

英文摘要:

In his PhD thesis, Abrams proved that, for a natural number n and a graph G with at least n vertices, the n-strand configuration space of G deformation retracts to a compact subspace, the discretized n-strand configuration space, provided G satisfies two conditions: each path between distinct essential vertices (vertices of degree not equal to 2) is of length at least n+1 edges, and each path from a vertex to itself which is not nullhomotopic is of length at least n+1 edges. Using Forman's discrete Morse theory for CW-complexes, we show the first condition can be relaxed to require only that each path between distinct essential vertices is of length at least n-1.

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