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arXiv 1304.7870math.CO
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置换模式、Stanley对称函数和广义Specht模

Permutation patterns, Stanley symmetric functions and generalized Specht modules

Sara Billey, Brendan Pawlowski

摘要:

推广了vexillary置换的概念,引入了一种由Stanley对称函数中Schur函数项数对S_infinity的过滤,第k个过滤层称为k-vexillary置换。我们表明,对于每个k,k-vexillary置换的特点是避免了一个有限集的模式。一个关键的步骤是一个Specht系列的建设,在詹姆斯和皮尔的意义上,为Specht模块相关联的图的置换。作为推论,我们证明了Liu关于某些置换图类的图簇的一个猜想。我们采用类似的技术来表征多重性自由斯坦利对称函数,以及置换,其图是相当于一个森林的意义上的刘。

英文摘要:

Generalizing the notion of a vexillary permutation, we introduce a filtration of S_infinity by the number of Schur function terms in the Stanley symmetric function, with the kth filtration level called the k-vexillary permutations. We show that for each k, the k-vexillary permutations are characterized by avoiding a finite set of patterns. A key step is the construction of a Specht series, in the sense of James and Peel, for the Specht module associated to the diagram of a permutation. As a corollary, we prove a conjecture of Liu on diagram varieties for certain classes of permutation diagrams. We apply similar techniques to characterize multiplicity-free Stanley symmetric functions, as well as permutations whose diagram is equivalent to a forest in the sense of Liu.

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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