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arXiv 1304.2691math.GRmath.AG
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刚性有限群的Bogomolov乘子

The Bogomolov multiplier of rigid finite groups

Ming-chang Kang, Boris Kunyavskii

摘要:

有限群$G$的Bogomolov乘子被定义为Schur乘子的子群,该Schur乘子由限制到$G$的所有交换子群后消失的上同调类组成.这个不变量在商空间$G$的双有理几何中起着重要的作用。我们表明,在许多情况下,消失的Bogomolov乘数是保证刚性的$G$在这个意义上,它没有外部类保持自同构。

英文摘要:

The Bogomolov multiplier of a finite group $G$ is defined as the subgroup of the Schur multiplier consisting of the cohomology classes vanishing after restriction to all abelian subgroups of $G$. This invariant of $G$ plays an important role in birational geometry of quotient spaces $V/G$. We show that in many cases the vanishing of the Bogomolov multiplier is guaranteed by the rigidity of $G$ in the sense that it has no outer class-preserving automorphisms.

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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