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arXiv 0909.1633math.RTmath.ACmath.CT
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可斜对称化簇代数的范畴化

Categorification of skew-symmetrizable cluster algebras

Laurent Demonet

摘要:

我们提出了一个新的框架来分类斜对称化簇代数。从一个具有有限群G作用的正合稳定2-Calabi-Yau范畴C出发,在C的极大刚性G-不变对象集上构造了一个G-等变突变.使用一个适当的集群字符,然后我们可以附加到这些数据显式斜对称集群代数。作为一个应用,我们证明了线性独立的集群单项式在这种设置。最后,我们说明了我们的建设与部分标志品种和幂幺子群的Kac-Moody群的例子,推广到非简单的花边的情况下的几个结果的Gei-Leclerc-Schröer。

英文摘要:

We propose a new framework for categorifying skew-symmetrizable cluster algebras. Starting from an exact stably 2-Calabi-Yau category C endowed with the action of a finite group G, we construct a G-equivariant mutation on the set of maximal rigid G-invariant objects of C. Using an appropriate cluster character, we can then attach to these data an explicit skew-symmetrizable cluster algebra. As an application we prove the linear independence of the cluster monomials in this setting. Finally, we illustrate our construction with examples associated with partial flag varieties and unipotent subgroups of Kac-Moody groups, generalizing to the non simply-laced case several results of Geiß-Leclerc-Schröer.

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