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arXiv 1607.06241math.RT
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块中心的Loewy长度

Loewy lengths of centers of blocks

Burkhard Külshammer, Benjamin Sambale

摘要:

设B是关于特征p>0的代数闭域F的有限群的块。在最近的一篇论文中,Otokita给出了B的中心ZB的Loewy长度LL(ZB)关于B的亏群D的上界。我们改进他的方法,以证明最佳界LL(ZB)\le LL(FD)时,D是阿贝尔。我们还改进了非交换亏群的Otokita界。作为应用,我们对块B进行分类,使得LL(ZB)\ge |D| /2.

英文摘要:

Let B be a block of a finite group with respect to an algebraically closed field F of characteristic p>0. In a recent paper, Otokita gave an upper bound for the Loewy length LL(ZB) of the center ZB of B in terms of a defect group D of B. We refine his methods in order to prove the optimal bound LL(ZB)\le LL(FD) whenever D is abelian. We also improve Otokita's bound for non-abelian defect groups. As an application we classify the blocks B such that LL(ZB)\ge |D|/2.

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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