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arXiv 1310.3702math.RTmath.CO
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广义中楣和依赖于刚性物体的改进的Caldero-Chapoton地图

Generalised friezes and a modified Caldero-Chapoton map depending on a rigid object

Thorsten Holm, Peter Jorgensen

摘要:

(通常)Caldero-Chapoton映射是从范畴的对象集合到整数上的Laurent多项式环的映射。在簇范畴的情况下,它将“可达”的不可分解对象映射到簇代数中相应的簇变量。这形式化了簇范畴是簇代数的“范畴化”的思想。Caldero-Chapoton映射的定义要求范畴是2-Calabi-Yau,并且映射依赖于范畴中的星团倾斜对象。我们研究的Caldero-Chapoton映射的一个修改版本,它只需要类别有一个Serre函子,并且只依赖于类别中的刚性对象。众所周知,通常的Caldero-Chapoton地图会产生所谓的中楣,例如Conway-Coxeter中楣。我们表明,修改后的Caldero-Chapoton地图产生了我们所谓的广义friezes,并为集群类别Dynkin类型A,它恢复了广义friezes介绍了由Bessenrodt和我们的组合手段。

英文摘要:

The (usual) Caldero-Chapoton map is a map from the set of objects of a category to a Laurent polynomial ring over the integers. In the case of a cluster category, it maps "reachable" indecomposable objects to the corresponding cluster variables in a cluster algebra. This formalises the idea that the cluster category is a "categorification" of the cluster algebra. The definition of the Caldero-Chapoton map requires the category to be 2-Calabi-Yau, and the map depends on a cluster tilting object in the category. We study a modified version of the Caldero-Chapoton map which only requires the category to have a Serre functor, and only depends on a rigid object in the category. It is well-known that the usual Caldero-Chapoton map gives rise to so-called friezes, for instance Conway-Coxeter friezes. We show that the modified Caldero-Chapoton map gives rise to what we call generalised friezes, and that for cluster categories of Dynkin type A, it recovers the generalised friezes introduced by combinatorial means by Bessenrodt and us.

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