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arXiv 1306.6272math.AT
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对角补的同伦群

Homotopy Groups of Diagonal Complements

Sadok Kallel, Ines Saihi

摘要:

对于$X$是一个连通的有限单纯复形,我们认为$Δ^d(X,n)$是$X$的$n$有序点的构形空间,使得它们中没有$d+1$是相等的,而$B^d(X,n)$是无序点构形的类似空间.当$d=1$时,这些减少到不同点的标准配置空间。我们描述了$Δ^d(X,n)$的同伦群(分别为. $B^d(X,n)$)在同伦方面(分别.同源性)组的$X$通过范围,这是一般尖锐。值得注意的是,只要我们允许点发生碰撞,配置空间的基本群$B^d(X,n)$就可进行阿贝尔化(即$d\geq 2$)。

英文摘要:

For $X$ a connected finite simplicial complex we consider $Δ^d(X,n)$ the space of configurations of $n$ ordered points of $X$ such that no $d+1$ of them are equal, and $B^d(X,n)$ the analogous space of configurations of unordered points. These reduce to the standard configuration spaces of distinct points when $d=1$. We describe the homotopy groups of $Δ^d(X,n)$ (resp. $B^d(X,n)$) in terms of the homotopy (resp. homology) groups of $X$ through a range which is generally sharp. It is noteworthy that the fundamental group of the configuration space $B^d(X,n)$ abelianizes as soon as we allow points to collide (i.e. $d\geq 2$).

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