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arXiv 1209.3476math.GTmath.CO
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关于子流形排列的补的连通分支数

On the number of connected components in complements to arrangements of submanifolds

I. N. Shnurnikov

摘要:

考虑d维闭流形M中n个连通余维1子流形的排列。设f是M中子流形并的补的连通分支数。证明了f通过n和同调群H_{d-1}(M)的一个尖锐下界.研究了实射影空间中的超平面排列和d维环面中的子环面排列的所有可能的f值的集合。

英文摘要:

We consider arrangements of n connected codimensional one submanifolds in closed d-dimensional manifold M. Let f be the number of connected components of the complement in M to the union of submanifolds. We prove the sharp lower bound for f via n and homology group H_{d-1}(M). The sets of all possible f-values for given n are studied for hyperplane arrangements in real projective spaces and for subtori arrangements in d-dimensional tori.

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