Infinitely generated pseudocompact modules for finite groups and Weiss' Theorem

Infinitely generated pseudocompact modules for finite groups and Weiss' Theorem
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有限群的无限生成伪紧模和 Weiss 定理

DOI:
10.1016/j.aim.2019.106925
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发表时间:
2018
影响因子:
1.7
通讯作者:
P. Zalesskii
P. Zalesskii
中科院分区:
数学1区
文献类型:
--
作者:
J. MacQuarrie;P. Symonds;P. Zalesskii

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在有限群的积分表示论中,最漂亮的结果之一是A。韦斯证明了有限p-群G的置换R-格是由正规子群N和格的N-不动点的限制决定的,其中R是p-进整数的有限扩张.利用相对同调代数中的技巧,将韦斯定理推广到有限群的无限生成伪紧格类,允许R是具有混合特征的完全离散赋值环. Cliff和韦斯的一个相关定理也推广到了这类模上.作为一个更一般结果的特例,证明了伪紧模置换覆盖的存在性。明确描述了置换覆盖。
One of the most beautiful results in the integral representation theory of finite groups is a theorem of A. Weiss that detects a permutationR-lattice for the finitep-groupGin terms of the restriction to a normal subgroupNand theN-fixed points of the lattice, whereRis a finite extension of thep-adic integers. Using techniques from relative homological algebra, we generalize Weiss' Theorem to the class of infinitely generated pseudocompact lattices for a finitep-group, allowingRto be any complete discrete valuation ring in mixed characteristic. A related theorem of Cliff and Weiss is also generalized to this class of modules. The existence of the permutation cover of a pseudocompact module is proved as a special case of a more general result. The permutation cover is explicitly described.
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