Про неперіодичні неабелеві групи із щільною системою неперіодичних неабелевих підгруп

Abstract

We will say that a non-Abelian group G has a dense system of normal non-periodic non-Abelian subgroups, if for any such pair of non-periodic non-Abelian subgroups A < B that A is not maximal in B, there exists a normal subgroup N located between A and B, ie. A ≤ N ≤ B (CND [NN]-group). It is proved that the infinite commutator of the CND [NN]-group is Abelian.