Cohomological Obstructions and Weak Crossed Products over Weak Hopf Algebras

Ramón González Rodríguez, Ana Belén Rodríguez Raposo

Let $H$ be a cocommutative weak Hopf algebra and let $(B,{\phi }_B)$ a weak left $H$-module algebra. In this paper, for a twisted convolution invertible morphism $σ:H\otimes H\rightar…