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arXiv 0710.4335math.RTmath.RA
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聚类变量的分母

Denominators of cluster variables

Aslak Bakke Buan, Bethany Marsh, Idun Reiten

摘要:

与任何非循环簇代数相关联的是一个对应的三角范畴,称为簇范畴。它是已知的,有一个一对一的对应关系之间的集群变量的集群代数和异常的不可分解的对象在集群类别诱导集群和集群倾斜对象之间的对应关系。固定集群倾斜对象T和对应的初始集群。根据Laurent现象,每个聚类变量都可以写成初始聚类中的Laurent多项式。我们给出了T上的条件,等价于以下事实:对于簇代数中的每个簇变量,其约化形式的分母具有由T的自同态代数上相应模的维数向量给出的指数.

英文摘要:

Associated to any acyclic cluster algebra is a corresponding triangulated category known as the cluster category. It is known that there is a one-to-one correspondence between cluster variables in the cluster algebra and exceptional indecomposable objects in the cluster category inducing a correspondence between clusters and cluster-tilting objects. Fix a cluster-tilting object T and a corresponding initial cluster. By the Laurent phenomenon, every cluster variable can be written as a Laurent polynomial in the initial cluster. We give conditions on T equivalent to the fact that the denominator in the reduced form for every cluster variable in the cluster algebra has exponents given by the dimension vector of the corresponding module over the endomorphism algebra of T.

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