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arXiv 1004.0830math.RTmath.RA
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通过具有infinite-dimensional态射空间的簇范畴的簇代数

Cluster algebras via cluster categories with infinite-dimensional morphism spaces

Pierre-Guy Plamondon

摘要:

我们应用我们以前的工作的簇字符的Hom-infinite集群范畴的理论集群代数。本文对反对称簇代数给出了Fomin和Zelevinsky的簇代数IV的猜想5.4,6.13,7.2,7.10和7.12的一个新的证明。我们还构建了一个明确的双射发送某些对象的集群类别的装饰表示的德克森,韦曼和Zelevinsky,并表明,它是兼容的突变在这两种设置。利用这个映射,我们给出了一个范畴的解释E-不变量,并表明,一个任意的装饰表示与消失的E-不变量的特点是由它的g-向量。最后,我们得到了一个替代公式的集群字符不一定是刚性的对象。

英文摘要:

We apply our previous work on cluster characters for Hom-infinite cluster categories to the theory of cluster algebras. We give a new proof of Conjectures 5.4, 6.13, 7.2, 7.10 and 7.12 of Fomin and Zelevinsky's Cluster algebras IV for skew-symmetric cluster algebras. We also construct an explicit bijection sending certain objects of the cluster category to the decorated representations of Derksen, Weyman and Zelevinsky, and show that it is compatible with mutations in both settings. Using this map, we give a categorical interpretation of the E-invariant and show that an arbitrary decorated representation with vanishing E-invariant is characterized by its g-vector. Finally, we obtain a substitution formula for cluster characters of not necessarily rigid objects.

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