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arXiv 2006.06949math.CO
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《史记》中的图案和戴克路径

Patterns in Shi tableaux and Dyck paths

Myrto Kallipoliti, Robin Sulzgruber, Eleni Tzanaki

摘要:

Shi图是在研究与经典根系有关的Shi超平面排列时产生的某些Young图的特殊二元填充。对于$A$类型,Shi tableaux的集合$\mathcal T$自然地与Dyck路径的集合重合,多年来已经引入并研究了各种模式的概念。在本文中,我们定义了一个概念的模式发生在$\mathcal T$,虽然它可以被视为一个模式的Dyck路径,它是由底层几何结构的tableaux。本文的主要目的是研究由模式包含定义的Shi tableaux的偏序集。更确切地说,我们确定明确的公式为每个$T\in\mathcal T$的上,下覆盖,我们认为模式避免最小的非平凡tableaux(大小2),并推广这些结果,以某些较大的尺寸tableau。最后,我们提出了一些悬而未决的问题和未来可能的方向。

英文摘要:

Shi tableaux are special binary fillings of certain Young diagrams which arise in the study of Shi hyperplane arrangements related to classical root systems. For type $A$, the set $\mathcal T$ of Shi tableaux naturally coincides with the set of Dyck paths, for which various notions of patterns have been introduced and studied over the years. In this paper we define a notion of pattern occurrence on $\mathcal T$ which, although it can be regarded as a pattern on Dyck paths, it is motivated by the underlying geometric structure of the tableaux. Our main goal in this work is to study the poset of Shi tableaux defined by pattern-containment. More precisely, we determine explicit formulas for upper and lower covers for each $T\in\mathcal T$, we consider pattern avoidance for the smallest non-trivial tableaux (size 2) and generalize these results to certain tableau of larger size. We conclude with open problems and possible future directions.

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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