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arXiv 1201.2193math.ATmath.CO
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球面的排列与射影空间

Arrangements of Spheres and Projective Spaces

Priyavrat Deshpande

摘要:

我们发展了球的排列理论。考虑正维球面中余维$1$子球面的有限集合。这个集合有两个偏序集:面偏序集和交偏序集。我们还关联了一个拓扑空间:这些子球面的切丛在周围球面的切丛中的并集的补。我们称这个空间为切丛补。在超平面安排的情况下,这个新概念的目的是了解交叉点的组合学和切丛补的拓扑之间的相互作用。本文给出了补的同伦型的一个封闭形式公式,并用相应的组合信息表示了它的一些拓扑不变量。

英文摘要:

We develop the theory of arrangements of spheres. Consider a finite collection of codimension-$1$ subspheres in a positive-dimensional sphere. There are two posets associated with this collection: the poset of faces and the poset of intersections. We also associate a topological space: the complement of the union of tangent bundles of these subspheres in the tangent bundle of the ambient sphere. We call this space the tangent bundle complement. As in the case of hyperplane arrangements the aim of this new notion is to understand the interaction between the combinatorics of the intersections and the topology of the tangent bundle complement. In the present paper we find a closed form formula for the homotopy type of the complement and express some of its topological invariants in terms of the associated combinatorial information.

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