Twistings, crossed coproducts and Hopf-Galois coextensions
Quantum Algebra
2007-05-23 v1 Rings and Algebras
Abstract
Let be a Hopf algebra. Ju and Cai introduced the notion of twisting of an -module coalgebra. In this note, 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.
Cite
@article{arxiv.math/0210460,
title = {Twistings, crossed coproducts and Hopf-Galois coextensions},
author = {S. Caenepeel and Dingguo Wang and Yanxin Wang},
journal= {arXiv preprint arXiv:math/0210460},
year = {2007}
}
Comments
20 pages