期刊名称：International Journal of Mathematics and Mathematical Sciences
印刷版ISSN：0161-1712
电子版ISSN：1687-0425
出版年度：2003
卷号：2003
DOI：10.1155/S0161171203212400
出版社：Hindawi Publishing Corporation
摘要：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.
