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arXiv 2103.03785math.GR
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一个exact sequence与群的Bogomolov乘子的平凡性

An exact sequence and triviality of Bogomolov multiplier of groups

Sumana Hatui

摘要:

有限群$G$的Bogomolov乘子$B_0(G)$是Schur乘子$H^2(G,\mathbb Q/\mathbb Z)$的子群,它由限制到$G$的每个交换子群后消失的上同调类组成。给出了$B_0(G)$的一个Hopf型公式的新证明,并导出了Bogomolov乘子的上同调形式的一个精确序列.利用这个正合序列,我们给出了相应的膨胀同态是满态映射和零映射的充要条件。最后,我们给出了$p^6$阶群的完整列表,对于奇素数$p$,具有平凡的Bogomolov乘子,从而完成了Chen和Ma 2020年的研究。

英文摘要:

The Bogomolov multiplier $B_0(G)$ of a finite group $G$ is the subgroup of the Schur multiplier $H^2(G,\mathbb Q/\mathbb Z)$ consisting of the cohomology classes which vanish after restricting to every abelian subgroup of $G$. We give a new proof of a Hopf-type formula for $B_0(G)$ and derive an exact sequence for the cohomological version of the Bogomolov multiplier. Using this exact sequence we provide necessary and sufficient conditions for the corresponding inflation homomorphism to be an epimorphism and to be the zero map. Finally, we give a complete list of groups of order $p^6$, for odd prime $p$, having trivial Bogomolov multiplier, so completing the 2020 investigation of Chen and Ma.

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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