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arXiv 1003.4916math.RT
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簇等价与分次导出等价

Cluster equivalence and graded derived equivalence

Claire Amiot, Steffen Oppermann

摘要:

本文介绍了一种新的方法来组织整体维数不超过2的代数。我们引入集群等价的概念,这些代数的基础上,他们的广义集群范畴是否是等价的。我们特别感兴趣的问题有多少信息是保留在其广义簇范畴的代数,或者,换句话说,如何密切相关的两个代数,如果他们有等价的广义簇范畴。我们的方法利用了广义聚类范畴中的聚类倾斜对象:我们首先观察到广义聚类范畴中的聚类倾斜对象与导出范畴的聚类倾斜子范畴是自然双射,然后证明了后者的一个识别定理.利用这个识别定理,我们给出了两个簇等价代数导出等价的精确判据。对于一个给定的代数,我们进一步描述了所有导出的等价代数,具有相同的标准集群倾斜对象在其广义集群范畴。最后,我们证明了在一般情况下,如果两个代数是簇等价的,那么(在一定条件下)这两个代数可以分次,使得分次模的范畴是导出等价的.为此,我们引入了具有势的分次箭图的突变,并证明了这一概念反映了导出范畴的突变。

英文摘要:

In this paper we introduce a new approach for organizing algebras of global dimension at most 2. We introduce the notion of cluster equivalence for these algebras, based on whether their generalized cluster categories are equivalent. We are particularly interested in the question how much information about an algebra is preserved in its generalized cluster category, or, in other words, how closely two algebras are related if they have equivalent generalized cluster categories. Our approach makes use of the cluster-tilting objects in the generalized cluster categories: We first observe that cluster-tilting objects in generalized cluster categories are in natural bijection with cluster-tilting subcategories of derived categories, and then prove a recognition theorem for the latter. Using this recognition theorem we give a precise criterion when two cluster equivalent algebras are derived equivalent. For a given algebra we further describe all the derived equivalent algebras which have the same canonical cluster tilting object in their generalized cluster category. Finally we show that in general, if two algebras are cluster equivalent, then (under certain conditions) the algebras can be graded in such a way that the categories of graded modules are derived equivalent. To this end we introduce mutation of graded quivers with potential, and show that this notion reflects mutation in derived categories.

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