Thévenaz, JacquesStalder, Bernard2009-11-132009-11-132009-11-132000https://infoscience.epfl.ch/handle/20.500.14299/44220For a finite group G, certain G-algebras associated to finite G-sets are studied, which generalize both the group algebra and Drinfeld's double. The modular representation theory of these algebras is considered and a striking reciprocity theorem is proved.thesis::doctoral thesis