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Skew derivations and the nil and prime radicals

Jeffrey BergenPiotr Grzeszczuk — 2012

Colloquium Mathematicae

We examine when the nil and prime radicals of an algebra are stable under q-skew σ-derivations. We provide an example which shows that even if q is not a root of 1 or if δ and σ commute in characteristic 0, then the nil and prime radicals need not be δ-stable. However, when certain finiteness conditions are placed on δ or σ, then the nil and prime radicals are δ-stable.

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