Abstract
We formulate the notion of cleft extensions in the Hopf-Galois theory in the framework of algebraic geometry. The unit group scheme of the algebra of a finite flat group scheme plays a key role.
Citation
Noriyuki Suwa. "Group algebras and normal basis problem." Tohoku Math. J. (2) 67 (4) 495 - 505, 2015. https://doi.org/10.2748/tmj/1450798068
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