Claude Cibils

Tensor product of Hopf bimodules over a group algebra . 
\`a para\^itre dans Proceedings American Math. Society. 
Pr\'epublication 320 de l'Institut Fourier (1995).

Overview. 
The monoidal structure of Hopf bimodules over a group algebra can be 
completely described by means of the structure constants, depending 
on the conjugacy classes. These results provides an interesting analogy 
with the comparison between the Hochschild ring cohomology of the group 
algebra, and the usual ring cohomology of the group.