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Invariants of the Sylow \(p\)-subgroup of the unit group of a commutative group ring of characteristic \(p\). (English) Zbl 0828.16037
Let \(RG\) be the group ring of an Abelian group \(G\) over a commutative ring \(R\) with identity of prime characteristic \(p\) and let \(S(RG)\) be the Sylow \(p\)-subgroup of the group \(V(RG)\) of normalized units (i.e. of augmentation 1) in \(RG\). We set \(R(p)=\{r\in R\mid r^p=0\}\) and \(R[p]=\{r\in R\mid r^p=1\}\). Let \(S\) be a subring of \(R\) containing the identity of \(R\).
The following two ring-theoretic results are proved in the paper. There exist group isomorphisms: \(R(p)/S(p)\cong R[p]/S[p]\) and \(R(p)/R^p(p)\cong R[p]/R^p[p]\), where \(R(p)\) and \(R[p]\) are additive and multiplicative groups, respectively. The main result of the paper is a computation of the Ulm-Kaplansky invariants of the group \(S(RG)\). This result finishes some investigations of S. D. Berman (1967), of the reviewer (1977) and of A. A. Bovdi and Z. F. Pataj (1978).
Reviewer: T.Mollov (Plovdiv)

16U60 Units, groups of units (associative rings and algebras)
20K99 Abelian groups
20C07 Group rings of infinite groups and their modules (group-theoretic aspects)
16S34 Group rings
20E07 Subgroup theorems; subgroup growth
Full Text: DOI
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