Two-sided (two-cosided) Hopf modules and Doi-Hopf modules for quasi-Hopf algebras

D. Bulacu, S. Caenepeel

Let $H$ be a finite dimensional quasi-Hopf algebra over a field $k$ and $\mathfrak{A}$ a right $H$-comodule algebra in the sense of Hausser and Nill. We first show that on the $k$…