Quasitriangular and differential structures on bicrossproduct Hopf algebras

Details Quasitriangular and differential structures on bicrossproduct Hopf algebras Quasitriangular and differential structures on bicrossproduct Hopf algebras

1997-01-30

arxiv.org/abs/q-alg/9701041v1

Mathematics

Quantum Algebra

38 pages latex, no figures

Scientific paper

Let X=GM be a finite group factorisation. It is shown that the quantum double D(H) of the associated bicrossproduct Hopf algebra $H=kM\cobicross k(G)$ is itself a bicrossproduct $kX\cobicross k(Y)$ associated to a group YX, where $Y=G\times M^{op}$. This provides a class of bicrossproduct Hopf algebras which are quasitriangular. We also construct a subgroup $Y^\theta X^\theta$ associated to every order-reversing automorphism $\theta$ of X. The corresponding Hopf algebra $kX^\theta\cobicross k(Y^\theta)$ has the same coalgebra as H. Using related results, we classify the first order bicovariant differential calculi on H in terms of orbits in a certain quotient space of X.

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