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arXiv 1002.1034math.RTmath.RA
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类属聚类特征

Generic cluster characters

G. Dupont

摘要:

设$\CC$是一个带有团倾斜对象$T$的Hom有限三角化2-Calabi-Yau范畴.在构造条件下,我们证明了存在一组$\mathcal G^T(\CC)$的通用值的集群字符相关的$T$。如果$\CC$具有Buan-Iyama-Reiten-Scott意义下的簇结构,则$\mathcal G^T(\CC)$包含相应簇代数的簇单项式的集合。此外,如果$\mathcal C$有2/3个不可分解的对象,则这些集合重合。当$\CC$是一个非循环群代数的群范畴,而$T$是规范的群倾斜对象时,这个集合与作者以前在非循环群代数的上下文中引入的类属变量的集合一致。特别是,它允许构造$\Z$ -线性基的无环簇代数。

英文摘要:

Let $\CC$ be a Hom-finite triangulated 2-Calabi-Yau category with a cluster-tilting object $T$. Under a constructibility condition we prove the existence of a set $\mathcal G^T(\CC)$ of generic values of the cluster character associated to $T$. If $\CC$ has a cluster structure in the sense of Buan-Iyama-Reiten-Scott, $\mathcal G^T(\CC)$ contains the set of cluster monomials of the corresponding cluster algebra. Moreover, these sets coincide if $\mathcal C$ has finitely many indecomposable objects. When $\CC$ is the cluster category of an acyclic quiver and $T$ is the canonical cluster-tilting object, this set coincides with the set of generic variables previously introduced by the author in the context of acyclic cluster algebras. In particular, it allows to construct $\Z$-linear bases in acyclic cluster algebras.

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