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- W2068454011 abstract "We provide a short proof of an analog of Nagataâs theorem for finite-dimensional Hopf algebras. The result, proved Hopf-algebraically by Sweedler and using group schemes by Demazure and Gabriel, says that a finite-dimensional cocommutative semisimple irreducible Hopf algebra is commutative. With mild base field assumptions such a Hopf algebra is just the dual of a $p$-group algebra. We give en route an easy proof of a version of Hochschildâs theorem on semisimple restricted enveloping algebras. Let $R{# _t}H$ denote a crossed product with an invertible cocycle $t$, where $H$ is a semisimple cocommutative Hopf algebra $H$ over a perfect field. The result above is applied to show that $R{# _t}H$ is semiprime if and only if $R$ is $H$-semiprime. The approach relies on results on ideals of the crossed product that are stable under the action of the dual of $H$ and the Fisher-Montgomery theorem for crossed products of finite groups." @default.
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- W2068454011 date "1992-02-01" @default.
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- W2068454011 title "Crossed products of semisimple cocommutative Hopf algebras" @default.
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- W2068454011 doi "https://doi.org/10.1090/s0002-9939-1992-1100646-7" @default.
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