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arXiv 2201.13044math.GR
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关于Artin群的抛物子群

On parabolic subgroups of Artin groups

Philip Möller, Luis Paris, Olga Varghese

摘要:

给定一个Artin群$A_Γ$,研究$A_Γ$的一个常用策略是将其约化为定义图具有小直径的抛物子群,即证明$A_Γ$具有一个特定性质当且仅当$A_Γ$的所有“小”抛物子群都具有此性质。由于“小”的抛物子群是$A_Γ$的拼图块,人们需要研究它们的行为,特别是它们的交集。我们在这里解决的猜想说,类的抛物子群的$A_Γ$是封闭的交。在完备Artin群中抛物子群的交是抛物的假设下,证明了完备抛物子群与任意抛物子群的交是抛物的.此外,我们使用Bass-Serre理论和Deligne复形的推广,将$A_Γ$的完备抛物子群的相交行为与不动点性质和$A_Γ$的自动连续性联系起来。

英文摘要:

Given an Artin group $A_Γ$, a common strategy in the study of $A_Γ$ is the reduction to parabolic subgroups whose defining graphs have small diameter, i.e. showing that $A_Γ$ has a specific property if and only if all "small" parabolic subgroups of $A_Γ$ have this property. Since "small" parabolic subgroups are the puzzle pieces of $A_Γ$ one needs to study their behavior, in particular their intersections. The conjecture we address here says that the class of parabolic subgroups of $A_Γ$ is closed under intersection. Under the assumption that intersections of parabolic subgroups in complete Artin groups are parabolic, we show that the intersection of a complete parabolic subgroup with an arbitrary parabolic subgroup is parabolic. Further, we connect the intersection behavior of complete parabolic subgroups of $A_Γ$ to fixed point properties and to automatic continuity of $A_Γ$ using Bass-Serre theory and a generalization of the Deligne complex.

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