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• W1780454568 abstract "Let $L/K$ be a finite Galois extension of fields with group $Gamma$. Associated to each Hopf-Galois structure on $L/K$ is a group $G$ of the same order as the Galois group $Gamma$. The type of the Hopf-Galois structure is by definition the isomorphism type of $G$. We investigate the extent to which general properties of either of the groups $Gamma$ and $G$ constrain those of the other. Specifically, we show that if $G$ is nilpotent then $Gamma$ is soluble, and that if $Gamma$ is abelian then $G$ is soluble. The proof of the latter result depends on the classification of finite simple groups. In contrast to these results, we give some examples where the groups $Gamma$ and $G$ have different composition factors. In particular, we show that a soluble extension may admit a Hopf-Galois structure of insoluble type." @default.
• W1780454568 created "2016-06-24" @default.
• W1780454568 creator A5067334578 @default.
• W1780454568 date "2014-12-18" @default.
• W1780454568 modified "2023-10-16" @default.
• W1780454568 title "Solubility criteria for Hopf-Galois structures" @default.
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