Artin核的图分裂
Graphical splittings of Artin kernels
AI总结:
本文研究直角Artin群的Artin核,证明其可显式分解为群的图,并在弦图情形下给出子群分类,对块图得到显式秩公式。
摘要:
我们研究Artin核,即直角Artin群的离散特征标的核,并证明它们可以以一种可从底层图显式计算的方式分解为群的图。当底层图是弦图时,我们证明每个这样的子群要么满射到一个无限生成自由群,要么是一个可变秩的广义Baumslag-Solitar群。特别地,对于块图(例如树),我们得到了一个显式的秩公式,并讨论了相关直角Artin群的纤维化空间的一些特征。
英文摘要:
We study Artin kernels, i.e. kernels of discrete characters of right-angled Artin groups, and we show that they decompose as graphs of groups in a way that can be explicitly computed from the underlying graph. When the underlying graph is chordal we show that every such subgroup either surjects to an infinitely generated free group or is a generalized Baumslag-Solitar group of variable rank. In particular for block graphs (e.g. trees), we obtain an explicit rank formula, and discuss some features of the space of fibrations of the associated right-angled Artin group.
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