English

On modules over group rings of groups with restrictions on the system of all proper subgroups

Group Theory 2013-08-20 v2

Abstract

We consider the class M\mathfrak M of R\bf R--modules where R\bf R is an associative ring. Let AA be a module over a group ring R\bf RGG where GG is a group and let L(G)\mathfrak L(G) be a set of all proper subgroups of GG such that if HL(G)H \in \mathfrak L(G) then A/CA(H)A/C_{A}(H) belongs to M\mathfrak M. We study an R\bf RGG--module AA such that GGG \not = G', CG(A)=1C_{G}(A) = 1, A/CA(G)∉MA/C_{A}(G) \not \in \mathfrak M, and M\mathfrak M is one of the classes: artinian R\bf R--modules, minimax R\bf R--modules, finite R\bf R--modules. We consider the cases: 1) M\mathfrak M is a class of all artinian R\bf R--modules, R\bf R is either a ring of integers or a ring of pp--adic integers; 2) M\mathfrak M is a class of all minimax R\bf R--modules, R\bf R is a ring of integers, G is a locally soluble group; 3) M\mathfrak M is a class of all finite R\bf R--modules, R\bf R is an associative ring. In these cases we prove that GG is isomorphic to a quasi--cyclic qq--group for some prime qq.

Keywords

Cite

@article{arxiv.1305.0744,
  title  = {On modules over group rings of groups with restrictions on the system of all proper subgroups},
  author = {O. Yu. Dashkova},
  journal= {arXiv preprint arXiv:1305.0744},
  year   = {2013}
}

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6 pages