Structure of group rings and the group of units of integral group rings: an invitation

E. Jespers ()
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E. Jespers: Department of Mathematics and Data Science

Indian Journal of Pure and Applied Mathematics, 2021, vol. 52, issue 3, 687-708

Abstract: Abstract During the past three decades fundamental progress has been made on constructing large torsion-free subgroups (i.e. subgroups of finite index) of the unit group $$\mathcal {U}(\mathbb {Z}G)$$ U ( Z G ) of the integral group ring $$\mathbb {Z}G$$ Z G of a finite group G. These constructions rely on explicit constructions of units in $$\mathbb {Z}G$$ Z G and proofs of main results make use of the description of the Wedderburn components of the rational group algebra $$\mathbb {Q}G$$ Q G . The latter relies on explicit constructions of primitive central idempotents and the rational representations of G. It turns out that the existence of reduced two degree representations play a crucial role. Although the unit group is far from being understood, some structure results on this group have been obtained. In this paper we give a survey of some of the fundamental results and the essential needed techniques.

Keywords: Group ring; Unit; Idempotent; Rational representations; 16S34; 16U40; 16U60; 16H10; 20C05 (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s13226-021-00179-5

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