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The Group of Galois Extensions Over Orders in
Authors:Robert Underwood
Affiliation:Department of Mathematics, Auburn University at Montgomery, Montgomery, Alabama 36117
Abstract:In this paper we characterize all Galois extensions over $H$ where $H$ is an arbitrary $R$-Hopf order in $KC_{p^{2}}$. We conclude that the abelian group of $H$-Galois extensions is isomorphic to a certain quotient of units groups in $Rtimes R$. This result generalizes the classification of $H$-Galois extensions, where $Hsubset KC_{p}$, due to Roberts, and also to Hurley and Greither.

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