Yetter-Drinfeld categories for quasi-Hopf algebras

Details Yetter-Drinfeld categories for quasi-Hopf algebras Yetter-Drinfeld categories for quasi-Hopf algebras

2003-11-21

arxiv.org/abs/math/0311379v2

Mathematics

Quantum Algebra

29 pages

Scientific paper

We show that all possible categories of Yetter-Drinfeld modules over a quasi-Hopf algebra $H$ are isomorphic. We prove also that the category $\yd^{\rm fd}$ of finite dimensional left Yetter-Drinfeld modules is rigid and then we compute explicitly the canonical isomorphisms in $\yd^{\rm fd}$. Finally, we show that certain duals of $H_0$, the braided Hopf algebra introduced in \cite{bn,bpv}, are isomorphic as braided Hopf algebras if $H$ is a finite dimensional triangular quasi-Hopf algebra.

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