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arXiv 1504.06377math.ACmath.CO
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D 型丛代数:伪三角剖分方法

Cluster algebras of type D: pseudotriangulations approach

Cesar Ceballos, Vincent Pilaud

AI总结:

本文提出基于中心对称伪三角剖分的D型丛代数组合模型,统一解释簇、箭图及突变,并给出用一两个图的完美匹配计算所有簇变量的新方法,应用于结合复形多面体实现。

摘要:

我们提出了一个组合模型,用于描述中心带小圆盘的正 $2n$ 边形的中心对称伪三角剖分上的 $D_n$ 型丛代数。该模型为簇、簇变量及其交换关系,以及箭图和它们的突变提供了方便且统一的解释。我们还提出了簇变量的一种新的组合解释,即删除图中两个顶点后的完美匹配。这一解释不同于文献中已知的解释。与其他解释相比,其主要特点是:对于固定的初始簇种子,只需一个或两个图即可计算所有簇变量。最后,我们讨论了该模型在 $D$ 型结合复形(associahedra)的多面体实现中的应用,以及与子词复形和 $c$-簇复形的联系。

英文摘要:

We present a combinatorial model for cluster algebras of type $D_n$ in terms of centrally symmetric pseudotriangulations of a regular $2n$-gon with a small disk in the centre. This model provides convenient and uniform interpretations for clusters, cluster variables and their exchange relations, as well as for quivers and their mutations. We also present a new combinatorial interpretation of cluster variables in terms of perfect matchings of a graph after deleting two of its vertices. This interpretation differs from known interpretations in the literature. Its main feature, in contrast with other interpretations, is that for a fixed initial cluster seed, one or two graphs serve for the computation of all cluster variables. Finally, we discuss applications of our model to polytopal realizations of type $D$ associahedra and connections to subword complexes and $c$-cluster complexes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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