
Here are the main results of the article under review: Theorem 1.1. Let \(\wp\) be a class of groups, which is closed under taking subgroups and quotients. Suppose that all metabelian groups of \(\wp\) are torsion-by-nilpotent. Then all soluble groups of \(\wp\) are torsion-by-nilpotent. Theorem 1.2. Let \(H\) be a normal subgroup of a group \(G\). If \(G/H'\) and \(H\) are (locally finite)-by-nilpotent, then \(G\) is (locally finite)-by-nilpotent. The last result is a generalization of Hall's well-known theorem on the nilpotency of a group \(G\), in which a normal subgroup \(H\) and the quotient \(G/H'\) are nilpotent.
General structure theorems for groups, Algebra and Number Theory, (locally finite)-by-nilpotent groups, soluble groups, Generalizations of solvable and nilpotent groups, torsion-by-nilpotent groups, metabelian groups, nilpotency
General structure theorems for groups, Algebra and Number Theory, (locally finite)-by-nilpotent groups, soluble groups, Generalizations of solvable and nilpotent groups, torsion-by-nilpotent groups, metabelian groups, nilpotency
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