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arXiv math/0607038math.RT
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抛物型Kazhdan-Lusztig多项式、体积函数和经典型广义Hall-Littlewood函数

Parabolic Kazhdan-Lusztig polynomials, plethysm and gereralized Hall-Littlewood functions for classical types

Cedric Lecouvey

摘要:

我们利用幂和体积函数算子引入了H函数,它插值于经典李群的Weyl特征标和Hall-Littlewood函数Q'之间.这些函数的系数的基础上的Weyl字符是抛物线Kazhdan-Lusztig多项式,因此,是非负的。我们证明了它们可以看作是通过限制到某些Levi子群而得到的分支系数的量子化。与线性群相关的H函数与Lascoux Leclerc和Thibon引入的多项式(LLT多项式)一致。

英文摘要:

We use power sums plethysm operators to introduce H functions which interpolate between the Weyl characters and the Hall-Littlewood functions Q' corresponding to classical Lie groups. The coefficients of these functions on the basis of Weyl characters are parabolic Kazhdan-Lusztig polynomials and thus, are nonnegative. We prove that they can be regarded as quantizations of branching coefficients obtained by restriction to certain Levi subgroups. The H functions associated to linear groups coincide with the polynomials introduced by Lascoux Leclerc and Thibon (LLT polynomials).

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