The National Natural Science Foundation of China(No.11871144,11901240).
First,the group crossed product over the Hopf group-algebras is defined,and the necessary and sufficient conditions for the group crossed product to be a group algebra are given.The cleft extension theory of the Hopf ...
The Research and Innovation Project for College Graduates of Jiangsu Province(No.CXLX_0094);the Natural Science Foundation of Chuzhou University(No.2010kj006Z)
Let π be a group with a unit 1; H is a Hopf π- coalgebra and A is a right π-H-comodule algebra. First, the notion of a two-sided relative (A, H)-Hopf π-comodule is introduced; then it is obtained that Hom A H (...