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arXiv 2302.02185math.COmath.NT
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簇代数与数论中的完美匹配问题

Perfect matching problems in cluster algebras and number theory

Ralf Schiffler

摘要:

这篇论文是我在2022年5月明尼苏达大学代数组合学会议上发表的演讲的一个稍微扩展的版本。我们在格路上引入了两个严格的序关系,并提出了几个公开的问题。这个主题涉及到马尔可夫数,拉格朗日谱,蛇图和簇代数的一次穿孔环面。我们的格子路径需要沿着北向和东向的台阶前进,并且永远不要越过对角线。为了定义序关系,我们首先为每个这样的格路$ω$构造蛇图$\mathcal{G}(ω)$和带图$\overline{\mathcal{G}(ω)}$。一阶关系$<_M$由蛇图的完美匹配数给出。二阶关系$<_L$由与带状图相关联的二次无理数的拉格朗日数给出。

英文摘要:

This paper is a slightly extended version of the talk I gave at the Open Problems in Algebraic Combinatorics conference at the University of Minnesota in May 2022. We introduce two strict order relations on lattice paths and formulate several open problems. The topic is related to Markov numbers, the Lagrange spectrum, snake graphs and the cluster algebra of the once punctured torus. Our lattice paths are required to proceed by North and East steps and never go over the diagonal. To define the order relations, we first construct a snake graph $\mathcal{G}(ω)$ and a band graph $\overline{\mathcal{G}(ω)}$ for every such lattice path $ω$. The first order relation $<_M$ is given by the number of perfect matchings of the snake graphs. The second order relation $<_L$ is given by the Lagrange number of a quadratic irrational associated to the band graph.

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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