Pure semisimple and K\"othe group rings
Abstract
In this article we provide a complete characterization of abelian group rings which are K\"othe rings. We also provide characterizations of (possibly non-abelian) group rings over division rings which are K\"othe rings, both in characteristic zero and in prime characteristic, and prove a Maschke type result for pure semisimplicity of group rings. Furthermore, we illustrate our results by several examples.
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