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Subnormal subgroups in $ U({\bf Z}G)$

Authors: Jairo Gonçalves, Jürgen Ritter and Sudarshan Sehgal
Journal: Proc. Amer. Math. Soc. 103 (1988), 375-382
MSC: Primary 20C05; Secondary 16A26
MathSciNet review: 943049
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Abstract: Let $ U$ be the unit group of the integral group ring of a finite group $ G$. We prove that every subgroup of $ U$ containing $ G$ and almost subnormal in $ U$ contains a noncyclic free group unless $ G$ is abelian or a Hamiltonian $ 2$-group.

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Article copyright: © Copyright 1988 American Mathematical Society