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arXiv 2106.04893math.RT
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关于A型约化球偶的球函数的乘法

On the multiplication of spherical functions of reductive spherical pairs of type A

Paolo Bravi, Jacopo Gandini

摘要:

设G是一个单复代数群,K是G的一个约化子群,使得G/K的坐标环是一个无重数的G-模.考虑C[G/K]的G-代数结构,研究了C[G/K]中不可约G-子模的积的不可约和的分解。当G/K的球面根生成A型根系时,我们提出了一个球面分解规则,它依赖于Stanley关于Jack对称函数相乘的一个猜想.除一种情况外,我们证明了当G/K的球面根生成的根系是秩为1的子系统的直和时,该规则成立.

英文摘要:

Let G be a simple complex algebraic group and let K be a reductive subgroup of G such that the coordinate ring of G/K is a multiplicity free G-module. We consider the G-algebra structure of C[G/K], and study the decomposition into irreducible summands of the product of irreducible G-submodules in C[G/K]. When the spherical roots of G/K generate a root system of type A we propose a conjectural decomposition rule, which relies on a conjecture of Stanley on the multiplication of Jack symmetric functions. With the exception of one case, we show that the rule holds true whenever the root system generated by the spherical roots of G/K is direct sum of subsystems of rank one.

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