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arXiv math/0603520math.CO
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交替排列与对称函数

Alternating permutations and symmetric functions

Richard P. Stanley

摘要:

我们利用对称函数的理论来列举{1,2,.,n}。这些类别包括以下内容:(1)w和w^{-1}都是交替的,(2)w具有某些特殊形状,例如(m-1,m-2,...,1),在RSK算法下,(3)w具有指定的循环类型,以及(4)w具有指定数目的不动点。我们还列举了交替排列的多重集。我们的大多数公式都是本影表达式,其中将表达式展开为变量E的幂后,E^k被解释为欧拉数E_k。作为一个小的推论,我们得到一个组合的解释系数的渐近展开出现在拉马努金的丢失的笔记本。

英文摘要:

We use the theory of symmetric functions to enumerate various classes of alternating permutations w of {1,2,...,n}. These classes include the following: (1) both w and w^{-1} are alternating, (2) w has certain special shapes, such as (m-1,m-2,...,1), under the RSK algorithm, (3) w has a specified cycle type, and (4) w has a specified number of fixed points. We also enumerate alternating permutations of a multiset. Most of our formulas are umbral expressions where after expanding the expression in powers of a variable E, E^k is interpreted as the Euler number E_k. As a small corollary, we obtain a combinatorial interpretation of the coefficients of an asymptotic expansion appearing in Ramanujan's Lost Notebook.

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