Triples of arrangements and local systems

Triples of arrangements and local systems
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三重安排和局部系统

DOI:
10.1090/s0002-9939-02-06428-6
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发表时间:
2001
期刊:
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通讯作者:
Daniel C. Cohen
Daniel C. Cohen
中科院分区:
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文献类型:
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作者:
Daniel C. Cohen

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对于一个三元组的复杂超平面排列,有一个众所周知的长的精确序列与补数的上同调有关。我们观察到这一结果推广到某些局部系数系,并利用这一推广来研究排列的特征变化。我们证明了第一个特征变种可以包含由任何顺序的字符翻译的成分,从而回答了A.Suciu的一个问题。
For a triple of complex hyperplane arrangements, there is a well-known long exact sequence relating the cohomology of the complements. We observe that this result extends to certain local coefficient systems, and use this extension to study the characteristic varieties of arrangements. We show that the first characteristic variety may contain components that are translated by characters of any order, thereby answering a question of A. Suciu.