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On the Root-Class Residuality of Certain Free Products of Groups with Normal Amalgamated Subgroups
Russian Mathematics ( IF 0.5 ) Pub Date : 2020-04-23 , DOI: 10.3103/s1066369x20030044
E. V. Sokolov , E. A. Tumanova

Let \({\cal K}\) be a root class of groups closed under taking quotient groups, G be a free product of groups A and B with amalgamated subgroups H and K. Let also H be normal in A, K be normal in B, and AutG(H) denote the set of automorphisms of H induced by all inner automorphisms of G. We prove a criterion for G to be residually a \({\cal K}\)-group provided AutG(H) is an abelian group or it satisfies some other conditions. We apply this result in the cases when A and B are bounded nilpotent groups or A/H, B/K\({\cal K}\).

中文翻译:

关于具有正常合并子组的组的某些自由产品的根类残差

\({\ cal K} \)为在取商组下封闭组的根G为组ABHK合并的子集的自由乘积HA中是正常的,K是正常的在,和自ģħ)表示该组构的ħ由内的所有构诱导ģ。我们证明了G的准则是残存的\({\ cal K} \)- group,前提是Aut GH)是一个阿贝尔群或它满足其他一些条件。我们将这个结果应用于A和B是有界幂等组或A / H,B / K∈ \({\ cal K} \)的情况
更新日期:2020-04-23
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