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arXiv math/0606775math.RAmath.CO
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$A_1^{(1)}$型簇代数的半正则基生成元

Semicanonical basis generators of the cluster algebra of type $A_1^{(1)}$

Andrei Zelevinsky

摘要:

研究了仿射型无系数簇代数$A_1^{(1)}$的簇变量和半正则基的虚元。P.Caldero和作者在math.RT/0604054中得到了这些元素的Laurent展开式的一个闭公式。作为副产品,给出了所讨论的洛朗多项式的组合解释,等价于G.Musiker和J.Propp在Math.CO/0602408中获得的解释。math.RT/0604054中的参数使用了P.Caldero和F.Chapoton(math.RT/0410184)对Laurent多项式的几何解释。本文给出了同样结果的一个快速、完备和完全初等的替代证明。

英文摘要:

We study the cluster variables and "imaginary" elements of the semicanonical basis for the coefficient-free cluster algebra of affine type $A_1^{(1)}$. A closed formula for the Laurent expansions of these elements was obtained by P.Caldero and the author in math.RT/0604054. As a by-product, there was given a combinatorial interpretation of the Laurent polynomials in question, equivalent to the one obtained by G.Musiker and J.Propp in math.CO/0602408. The arguments in math.RT/0604054 used a geometric interpretation of the Laurent polynomials due to P.Caldero and F.Chapoton (math.RT/0410184). This note provides a quick, self-contained and completely elementary alternative proof of the same results.

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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