L-R-smash product for (quasi) Hopf algebras

Abstract

We introduce a more general version of the so-called L-R-smash product and study its relations with other kinds of crossed products (two-sided smash and crossed product and diagonal crossed product). We also give an interpretation of the L-R-smash product in terms of an L-R-twisting datum.

21 pages, Latex, no figures; one more section added