%0 Journal Article
%T Twistings, crossed coproducts, and Hopf-Galois coextensions
%A S. Caenepeel
%A Dingguo Wang
%A Yanxin Wang
%J International Journal of Mathematics and Mathematical Sciences
%D 2003
%I Hindawi Publishing Corporation
%R 10.1155/s0161171203212400
%X Let H be a Hopf algebra. Ju and Cai (2000) introduced the notion of twisting of an H-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 H-Galois coextension remains H-Galois if the twisting is invertible.
%U http://www.hindawi.com/journals/ijmms/2003/214195/abs/