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arXiv 1002.0918math.GT
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关于环弗洛尔同调中符号约定的注记

A note on sign conventions in link Floer homology

Sucharit Sarkar

摘要:

对于S^3中的纽结,在Z上定义了纽结弗洛尔同调的双分次帽子形式;然而,对于S^3中的链L,当|L| =l>1时,存在2个定义在Z上的链弗洛尔同调的二阶hat形式,链弗洛尔同调的多阶hat形式仅从全纯考虑定义在F_2上,并且存在使用网格图定义在Z上的多级版本的链弗洛尔同调。本文将F_2-值多级链弗洛尔同调理论推广到2^{l-1}个Z-值理论,试图解决这个问题.一个链的格图在F_2上产生一个链复形,它的同调关系到该链在F_2上的多级帽子形式的链弗洛尔同调.一个符号细化的链复形的存在,并为结,我们建立的符号细化确实对应的帽子版本的结弗洛尔同调的符号分配。对于链,我们在网格图上建立了2^{l-1}个符号赋值,并证明了它们与Z上链弗洛尔同调的2^{l-1}个多重帽子版本有关,其中一个对应于网格链复形的已有符号加细.

英文摘要:

For knots in S^3, the bi-graded hat version of knot Floer homology is defined over Z; however, for a link L in S^3 with #|L|=l>1, there are 2^{l-1} bi-graded hat versions of link Floer homology defined over Z, the multi-graded hat version of link Floer homology is only defined over F_2 from holomorphic considerations, and there is a multi-graded version of link Floer homology defined over Z using grid diagrams. In this short note, we try to address this issue, by extending the F_2-valued multi-graded link Floer homology theory to 2^{l-1} Z-valued theories. A grid diagram representing a link gives rise to a chain complex over F_2, whose homology is related to the multi-graded hat version of link Floer homology of that link over F_2. A sign refinement of the chain complex exists, and for knots, we establish that the sign refinement does indeed correspond to the sign assignment for the hat version of the knot Floer homology. For links, we create 2^{l-1} sign assignments on the grid diagrams, and show that they are related to the 2^{l-1} multi-graded hat versions of link Floer homology over Z, and one of them corresponds to the existing sign refinement of the grid chain complex.

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