ON GROUPS IN WHICH SUBNORMAL SUBGROUPS OF INFINITE RANK ARE COMMENSURABLE WITH SOME NORMAL SUBGROUP

被引:1
|
作者
Dardano, Ulderico [1 ]
De Mari, Fausto [1 ]
机构
[1] Univ Napoli Federico II, Dipartimento Matemat & Applicaz R Caccioppoli, Via Cintia Monte S Angelo, I-80126 Naples, Italy
关键词
transitivity; core-finite; normal-by-finite; close to normal;
D O I
10.22108/ijgt.2021.127143.1671
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
We study soluble groups G in which each subnormal subgroup H with infinite rank is commensurable with a normal subgroup, i.e. there exists a normal subgroup N such that H boolean AND N has finite index in both H and N. We show that if such a G is periodic, then all subnormal subgroups are commensurable with a normal subgroup, provided either the Hirsch-Plotkin radical of G has infinite rank or G is nilpotent-by-abelian (and has infinite rank).
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页码:37 / 42
页数:6
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