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Abstract commensurators of surface groups
Journal of Topology and Analysis ( IF 0.8 ) Pub Date : 2019-08-02 , DOI: 10.1142/s1793525320500235 Khalid Bou-Rabee 1 , Daniel Studenmund 2
Journal of Topology and Analysis ( IF 0.8 ) Pub Date : 2019-08-02 , DOI: 10.1142/s1793525320500235 Khalid Bou-Rabee 1 , Daniel Studenmund 2
Affiliation
Let Γ be the fundamental group of a surface of finite type and Comm ( Γ ) be its abstract commensurator. Then Comm ( Γ ) contains the solvable Baumslag–Solitar groups 〈 a , b : a b a − 1 = b n 〉 for any n > 1 . Moreover, the Baumslag–Solitar group 〈 a , b : a b 2 a − 1 = b 3 〉 has an image in Comm ( Γ ) that is not residually finite. Our proofs are computer-assisted. Our results also illustrate that finitely-generated subgroups of Comm ( Γ ) are concrete objects amenable to computational methods. For example, we give a proof that 〈 a , b : a b 2 a − 1 = b 3 〉 is not residually finite without the use of normal forms of HNN extensions.
中文翻译:
表面基团的抽象通量
让Γ 是有限类型曲面的基群,并且通讯 ( Γ ) 成为它的抽象通量者。然后通讯 ( Γ ) 包含可解的 Baumslag–Solitar 群〈 一种 , b : 一种 b 一种 - 1 = b n 〉 对于任何n > 1 . 此外,Baumslag-Solitar 群〈 一种 , b : 一种 b 2 一种 - 1 = b 3 〉 有一个图像通讯 ( Γ ) 那不是剩余有限的。我们的证明是计算机辅助的。我们的结果还表明,有限生成的子群通讯 ( Γ ) 是适用于计算方法的具体对象。例如,我们给出一个证明〈 一种 , b : 一种 b 2 一种 - 1 = b 3 〉 如果不使用 HNN 扩展的正常形式,则不是剩余有限的。
更新日期:2019-08-02
中文翻译:
表面基团的抽象通量
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