< Back to previous page
Publication
On cross product Hopf algebras
Journal Contribution - Journal Article
Let $A$ and $B$ be algebras and coalgebras in a braided monoidal category $\Cc$, and suppose that we have a cross product algebra and a cross product coalgebra structure on $A\ot B$. We present necessary and sufficient conditions for $A\ot B$ to be a bialgebra, and sufficient conditions for $A\ot B$ to be a Hopf algebra. We discuss when such a cross product Hopf algebra is a double cross (co)product, a biproduct, or, more generally, a smash (co)product Hopf algebra. In each of these cases, we provide an explicit description of the associated Hopf algebra projection.
Journal: Journal of Algebra
ISSN: 0021-8693
Volume: 377
Pages: 1-48
Publication year:2013
Keywords:cross product, monoidal category, smash product, Hopf datum