Decomposition of double cosets in p-adic groups

Decomposition of double cosets in p-adic groups
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p-进群中双陪集的分解

DOI:
10.2140/pjm.2001.197.97
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发表时间:
2001
影响因子:
0.6
通讯作者:
Joshua M. Lansky
Joshua M. Lansky
中科院分区:
数学4区
文献类型:
--
作者:
Joshua M. Lansky

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设G是局部紧域F上具有非平凡离散赋值的分裂群。利用这类群的结构理论和Coxeter群的理论,得到了含Iwahori子群的子群P1,P2的双陪集P1σP2分解为P2的左陪集的一般公式.当P_1和P_2是同一超特殊子群时,我们利用这个结果导出了球面Hecke代数中元素的度的Iwahori公式.
Let G be a split group over a locally compact field F with non-trivial discrete valuation. Employing the structure theory of such groups and the theory of Coxeter groups, we obtain a general formula for the decomposition of double cosets P1σP2 of subgroups P1, P2 ⊂ G(F ) containing an Iwahori subgroup into left cosets of P2. When P1 and P2 are the same hyperspecial subgroup, we use this result to derive a formula of Iwahori for the degrees of elements of the spherical Hecke algebra.