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arXiv 2008.13675math.GR
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群的积分 II

Integrals of groups II

João Araújo, Peter J. Cameron, Carlo Casolo, Francesco Matucci, Claudio Quadrelli

AI总结:

本文继续研究群的积分(换位子子群同构于给定群的群),给出有限可积群积分阶数上界的充分条件、阿贝尔群幂零积分的存在性,并刻画多种群类的积分,最后提出开放问题。

摘要:

群 $G$ 的“积分”是一个群 $H$,其换位子子群同构于 $G$。本文继续 arXiv:1803.10179 中开始的关于群的积分的研究。我们研究:(1)有限可积群积分阶数上界的一个充分条件,以及群可积的一个必要条件。(2)阿贝尔 $p$-群存在 $p$-群积分的条件,以及所有阿贝尔群存在幂零积分。(3)(有限或无限)阿贝尔群的积分,包括幂零积分、在某个积分中具有有限指数的群、周期群、无挠群和有限生成群。(4)来自给定簇的群的积分簇、可积群的簇,以及其积分(若存在)仍属于该类的群类。(5)profinite 群的积分,以及有限生成 profinite 无中心群可积性的一个刻画。(6)笛卡尔积的积分,并用于构造没有 profinite 积分的可积 profinite 群的例子。我们以若干开放问题结束本文。

英文摘要:

An $integral$ of a group $G$ is a group $H$ whose commutator subgroup is isomorphic to $G$. This paper continues the investigation on integrals of groups started in the work arXiv:1803.10179. We study: (1) A sufficient condition for a bound on the order of an integral for a finite integrable group and a necessary condition for a group to be integrable. (2) The existence of integrals that are $p$-groups for abelian $p$-groups, and of nilpotent integrals for all abelian groups. (3) Integrals of (finite or infinite) abelian groups, including nilpotent integrals, groups with finite index in some integral, periodic groups, torsion-free groups and finitely generated groups. (4) The variety of integrals of groups from a given variety, varieties of integrable groups and classes of groups whose integrals (when they exist) still belong to such a class. (5) Integrals of profinite groups and a characterization for integrability for finitely generated profinite centreless groups. (6) Integrals of Cartesian products, which are then used to construct examples of integrable profinite groups without a profinite integral. We end the paper with a number of open problems.

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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