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arXiv 1203.6509math.COmath.RT
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渐近表示论的组合学

Combinatorics of asymptotic representation theory

Piotr Śniady

摘要:

对称群S_n的表示论与组合学密切相关:组合对象如Young tableaux和组合算法如Murnaghan-Nakayama规则。当n趋于无穷大时,这些组合对象和算法的结构变得复杂,很难从中提取出一些有意义的渐近问题的答案。为了克服这些困难,20世纪90年代,人们提出了一类关于对称群的表示论的对偶组合学。我们将集中在其亮点之一:Kerov多项式表示字符的条款,所谓的,自由累积量。

英文摘要:

The representation theory of the symmetric groups S_n is intimately related to combinatorics: combinatorial objects such as Young tableaux and combinatorial algorithms such as Murnaghan-Nakayama rule. In the limit as n tends to infinity, the structure of these combinatorial objects and algorithms becomes complicated and it is hard to extract from them some meaningful answers to asymptotic questions. In order to overcome these difficulties, a kind of dual combinatorics of the representation theory of the symmetric groups was initiated in 1990s. We will concentrate on one of its highlights: Kerov polynomials which express characters in terms of, so called, free cumulants.

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