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Class-preserving automorphisms of certain HNN extensions
Journal of Algebra and Its Applications ( IF 0.8 ) Pub Date : 2021-03-26 , DOI: 10.1142/s0219498822501328 Wei Zhou 1 , Goansu Kim 2
中文翻译:
某些 HNN 扩展的保类自同构
更新日期:2021-03-26
Journal of Algebra and Its Applications ( IF 0.8 ) Pub Date : 2021-03-26 , DOI: 10.1142/s0219498822501328 Wei Zhou 1 , Goansu Kim 2
Affiliation
We consider HNN extensions , where are normal subgroups of and . We show that class-preserving automorphisms of those HNN extensions are all inner if satisfies certain conditions. From Grossman’s result, it follows that outer automorphism groups of such conjugacy separable HNN extensions are residually finite.
中文翻译:
某些 HNN 扩展的保类自同构
我们考虑 HNN 扩展, 在哪里是正规子群和. 我们证明了这些 HNN 扩展的保类自同构都是内部的,如果满足一定条件。从 Grossman 的结果可以看出,这种共轭可分离 HNN 扩展的外部自同构群是剩余有限的。