Group-cograded multiplier Hopf (*-)algebras

A. T. Abd El-hafez, L. Delvaux, A. Van Daele

Let $G$ be a group and assume that $(A_p{)}_{p\in G}$ is a family of algebras with identity. We have a {\it Hopf $G$-coalgebra} (in the sense of Turaev) if, for each pair $p,q\in G$,…