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arXiv math/0301125math.RT
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关于扭群环的表示

On representations of twisted group rings

Matthias Kuenzer

摘要:

我们将群环理论的某些部分推广到扭曲的情况。设G是一个有限群,它(可能平凡地)作用在一个特征互质于该运算的核的阶的域L上。设L中的K是该运算的不动域,S是一个离散赋值环,其域为分式K,极大理想由pi生成,且L中有整闭包T.本文计算了扭群环TG在LG中的极大序模的长度.此外,如果S/piS是有限的,我们计算了TG/Jac(TG)的中心的S/piS-维数.如果这个商是分裂半单的,这就产生了一个简单T G-模的数目的公式,推广了布劳尔的公式。

英文摘要:

We generalize certain parts of the theory of group rings to the twisted case. Let G be a finite group acting (possibly trivially) on a field L of characteristic coprime to the order of the kernel of this operation. Let K in L be the fixed field of this operation, let S be a discrete valuation ring with field of fractions K, maximal ideal generated by pi and integral closure T in L. We compute the colength of the twisted group ring T G in a maximal order in L G. Moreover, if S/pi S is finite, we compute the S/pi S- dimension of the center of T G/Jac(T G). If this quotient is split semisimple, this yields a formula for the number of simple T G-modules, generalizing Brauer's formula.

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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