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arXiv 0706.0089math.GT
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组合链弗洛尔同调的符号加细

Sign refinement for combinatorial link Floer homology

Étienne Gallais

摘要:

链接弗洛尔同调是一个不变量的链接,最近已经完全描述了组合的方式。它最初是用模2系数构造的,由于符号细化,它被推广到整数系数。本文利用置换群的自旋扩张,给出了与整数系数网格图相关联的组合链Floer链复形的另一种构造方法.我们证明了这个复杂的过滤的同调是一个不变的链接,它给出了以前的符号加细通过一个2-上同调类对应的自旋扩展的置换群。

英文摘要:

Link Floer homology is an invariant for links which has recently been described entirely in a combinatorial way. Originally constructed with mod 2 coefficients, it was generalized to integer coefficients thanks to a sign refinement. In this paper, thanks to the spin extension of the permutation group we give an alternative construction of the combinatorial link Floer chain complex associated to a grid diagram with integer coefficients. We prove that the filtered homology of this complex is an invariant for the link and that it gives the previous sign refinement by means of a 2-cohomological class corresponding to the spin extension of the permutation group.

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