Resumen de Hopfish algebras

Xiang Tang, Alan Weinstein, Chenchang Zhu

• We introduce a notion of "hopfish algebra" structure on an associative algebra, allowing the structure morphisms (coproduct, counit, antipode) to be bimodules rather than algebra homomorphisms. We prove that quasi-Hopf algebras are hopfish algebras. We find that a hopfish structure on the algebra of functions on a finite set G is closely related to a ¿hypergroupoid¿ structure on G. The Morita theory of hopfish algebras is also discussed.