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A remark on torsion-free subgroups in group rings

2016
Let \(R\) be an integral domain of characteristic \(0\) and \(G\) be a group. For any normal subgroup \(M\) of \(G\) denote by \(\Delta_R(G,M)\) the kernel of the natural homomorphism from \(RG\) to \(RG/M\). For any group \(M\) let \(TM\) be the set of torsion elements in \(M\).
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