On the separability of subgroups of nilpotent groups by root classes of groups

被引:3
|
作者
Sokolov, Evgeny Victorovich [1 ]
机构
[1] Ivanovo State Univ, Ivanovo, Russia
基金
俄罗斯科学基金会;
关键词
GENERALIZED FREE-PRODUCTS; CLASS RESIDUALITY; CYCLIC SUBGROUP; FINITENESS;
D O I
10.1515/jgth-2022-0021
中图分类号
O1 [数学];
学科分类号
0701 ; 070101 ;
摘要
Suppose that e is a class of groups consisting only of periodic groups and beta(e/0 is the set of prime numbers that do not divide the order of any element of a e-group. It is easy to see that if a subgroup Y of a group X is e-separable in this group, then it is beta(e/0-isolated in X. Let us say that X has the property e-Sep if all of its beta(e/0-isolated subgroups are r-separable. We find a condition that is sufficient for a nilpotent group N to have the property r-Sep providede is a root class. We also prove that if N is torsion-free, then the indicated condition is necessary for this group to have r-Sep.
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页码:751 / 777
页数:27
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