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arXiv 2502.03215math.GRmath.COmath.RA
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Bestvina-Brady群的子群

Subgroups of Bestvina-Brady groups

Simone Blumer

AI总结:

本文刻画了Bestvina-Brady群的每个子群均为直角Artin群的图,并据此证实了这些群pro-p完备化的若干Galois理论猜想。

摘要:

在1987年发表于《代数杂志》的《图群的子群》一文中,Droms证明了:由有限单纯图$Γ$定义的直角Artin群(RAAG)的所有子群本身都是RAAG,当且仅当$Γ$不含诱导正方形图,也不含长度为$3$的线图。本工作为RAAG的一类特定正规子群,即Bestvina-Brady群,提供了类似的结果:我们刻画了那些使得此类群的每个子群本身都是RAAG的图。进而,我们证实了关于这些群的pro-$p$完备化的若干Galois理论猜想。

英文摘要:

In "Subgroups of Graph Groups", 1987, J. Alg., Droms proved that all the subgroups of a right-angled Artin group (RAAG) defined by a finite simplicial graph $Γ$ are themselves RAAGs if, and only if, $Γ$ has no induced square graph nor line-graph of length $3$. The present work provides a similar result for specific normal subgroups of RAAGs, called Bestvina-Brady groups: We characterize those graphs in which every subgroup of such a group is itself a RAAG. In turn, we confirm several Galois theoretic conjectures for the pro-$p$ completions of these groups.

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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