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arXiv 1302.1052math.COmath.RA
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有限型簇代数的分母向量与相容度

Denominator vectors and compatibility degrees in cluster algebras of finite type

Cesar Ceballos, Vincent Pilaud

摘要:

本文给出了有限型簇代数的簇变量的分母向量关于任何初始簇种子的两种简单描述:一种是用S定义的几乎正根之间的相容度表示的; Fomin和A. Zelevinsky,和其他方面的根功能的某一子字复杂。这些描述仅仅依赖于线性代数。他们提供了两个简单的证明已知的事实,即任何非初始聚类变量的分母向量相对于任何初始聚类种子具有非负的条目,并不同于零。

英文摘要:

We present two simple descriptions of the denominator vectors of the cluster variables of a cluster algebra of finite type, with respect to any initial cluster seed: one in terms of the compatibility degrees between almost positive roots defined by S. Fomin and A. Zelevinsky, and the other in terms of the root function of a certain subword complex. These descriptions only rely on linear algebra. They provide two simple proofs of the known fact that the denominator vector of any non-initial cluster variable with respect to any initial cluster seed has non-negative entries and is different from zero.

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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