S. Caenepeel, Dingguo Wang, Yanxin Wang, "Twistings, crossed coproducts, and Hopf-Galois coextensions", International Journal of Mathematics and Mathematical Sciences, vol. 2003, Article ID 214195, 21 pages, 2003. https://doi.org/10.1155/S0161171203212400
Twistings, crossed coproducts, and Hopf-Galois coextensions
Let be a Hopf algebra. Ju and Cai (2000) introduced the notion of twisting of an -module coalgebra. In this paper, we study the relationship between twistings, crossed coproducts, and Hopf-Galois coextensions. In particular, we show that a twisting of an -Galois coextension remains -Galois if the twisting is invertible.
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