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arXiv 2201.08329math.GR
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大类型 Artin 群的同构问题

The isomorphism problem for large-type Artin groups

Nicolas Vaskou

AI总结:

本文通过纯代数重构 Coxeter 群解决了大类型 Artin 群的同构问题,并利用二面体 Artin 子群分类建立了 2 维 Artin 群的刚性结果,同时刻画了球型抛物子群的保持条件及余 Hopf 性质。

摘要:

本文解决了所有大类型 Artin 群的同构问题。我们的策略涉及以纯代数方式重构与大类型 Artin 群相关联的 Coxeter 群。这回答了 Charney 提出的若干问题。我们还一般地研究了 2 维 Artin 群。通过对它们所有的二面体 Artin 子群进行分类,我们能够对所有 2 维 Artin 群给出强刚性结果。我们证明了 2 维 Artin 群中的“大多数”标准生成元在同构下(在共轭意义下)被保持。我们还证明,大类型 Artin 群之间的同构保持球型抛物子群的集合当且仅当定义图没有偶数标号叶。最后,我们证明定义图具有偶数标号叶的 Artin 群绝不是余 Hopf 的。

英文摘要:

In this paper we solve the isomorphism problem for all large-type Artin groups. Our strategy involves reconstructing the Coxeter groups associated with large-type Artin groups in a purely algebraic way. This answers several questions raised by Charney. We also study 2-dimensional Artin groups in general. By classifying all their dihedral Artin subgroups, we are able to give strong results of rigidity for all 2-dimensional Artin groups. We prove that "most" standard generators in 2-dimensional Artin groups are preserved under isomorphisms (up to conjugation). We also show that an isomorphism between large-type Artin groups preserves the set of spherical parabolic subgroups if and only if the defining graphs do not have even-labelled leaves. Finally, we show that Artin groups whose defining graphs have even-labelled leaves are never co-Hopfian.

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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