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arXiv 1701.04886math.AT
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单纯同伦理论、环同调与Khovanov同调

Simplicial Homotopy Theory, Link Homology and Khovanov Homology

Louis H Kauffman

摘要:

本文的目的是指出单纯同伦理论中的单纯方法和著名的Dold-Kan构造可以有效地应用于将链接同调论转换为同伦论。Dold和Kan证明了有一个函子从交换环上的链复形范畴到该环上的单纯对象范畴,使得链同伦映射到单纯范畴中的同伦映射。此外,这是范畴的等价。这样,给定一个链环同调论,我们构造一个将链环图映射到一类单纯对象的映射,使得由Reidemeister移动所关联的链环图在循环或去循环时将产生同伦等价的单纯对象,并且这些对象的同伦群将等于原链环同调论的链环同调群.该结构独立于特定的连接同调论。当链复形本身(通过面映射)从满足Kan扩张条件的单纯对象导出时,产生关于链复形的同伦单纯对象的简化点出现。在这种情况下,可以使用单纯对象,而不是将多尔-坎函子应用于链复形。我们将给出关于Khovanov同调的这种情况的例子。我们将在单独的文件中调查这一通信的详细工作。本说明的目的是宣布在这个领域中使用单纯形方法的基本关系。因此,我们所做的不仅仅是引用Dold-Kan定理。我们给一个简单的理论回顾,我们指出具体的建设,特别是在有关Khovanov同源性,可用于使单纯同伦类型直接。

英文摘要:

The purpose of this note is to point out that simplicial methods and the well-known Dold-Kan construction in simplicial homotopy theory can be fruitfully applied to convert link homology theories into homotopy theories. Dold and Kan prove that there is a functor from the category of chain complexes over a commutative ring with unit to the category of simplicial objects over that ring such that chain homotopic maps go to homotopic maps in the simplicial category. Furthermore, this is an equivalence of categories. In this way, given a link homology theory, we construct a mapping taking link diagrams to a category of simplicial objects such that up to looping or delooping, link diagrams related by Reidemeister moves will give rise to homotopy equivalent simplicial objects, and the homotopy groups of these objects will be equal to the link homology groups of the original link homology theory. The construction is independent of the particular link homology theory. A simplifying point in producing a homotopy simplicial object in relation to a chain complex occurs when the chain complex is itself derived (via face maps) from a simplicial object that satisfies the Kan extension condition. Under these circumstances one can use that simplicial object rather than apply the Dold-Kan functor to the chain complex. We will give examples of this situation in regard to Khovanov homology. We will investigate detailed working out of this correspondence in separate papers. The purpose of this note is to announce the basic relationships for using simplicial methods in this domain. Thus we do more than just quote the Dold-Kan Theorem. We give a review of simplicial theory and we point to specific constructions, particularly in relation to Khovanov homology, that can be used to make simplicial homotopy types directly.

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