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arXiv 1201.0032math.CO
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根上反射作用的伪度

Fake degrees for reflection actions on roots

Victor Reiner, Zhiwei Yun

摘要:

一个秩为l、Coxeter数为h的有限不可约实反射群具有基数为h*l的根系。证明了置换作用在其根上的伪度可被[h] q = 1+q+q^2+.+整除. q^{h-1},而在简单类型中,它等于[h]_q乘以q^{e_i - 1}的和,其中e_i贯穿指数,因此e_i - 1是余度。

英文摘要:

A finite irreducible real reflection group of rank l and Coxeter number h has root system of cardinality h*l. It is shown that the fake degree for the permutation action on its roots is divisible by [h]_q = 1+q+q^2+...+q^{h-1}, and that in simply-laced types, it equals [h]_q times the summation of q^{e_i - 1} where e_i runs through the exponents, so that e_i - 1 are the codegrees.

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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