## Abstract

We study certain aspects of finite-dimensional non-semisimple symmetric Hopf algebras H and their duals H^{*}. We focus on the set I (H) of characters of projective H-modules which is an ideal of the algebra of cocommutative elements of H^{*}. This ideal corresponds via a symmetrizing form to the projective center (Higman ideal) of H which turns out to be Λ H, where Λ is an integral of H and {A figure is presented} is the left adjoint action of H on itself. We describe Λ H via primitive and central primitive idempotents of H. We also show that it is stable under the quantum Fourier transform. Our best results are obtained when H is a factorizable ribbon Hopf algebra over an algebraically closed field of characteristic 0. In this case Λ H is also the image of I (H) under a "translated" Drinfel'd map. We use this fact to prove the existence of a Steinberg-like character. The above ingredients are used to prove a Verlinde-type formula for Λ H.

Original language | English |
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Pages (from-to) | 4300-4316 |

Number of pages | 17 |

Journal | Journal of Algebra |

Volume | 320 |

Issue number | 12 |

DOIs | |

State | Published - 15 Dec 2008 |

## Keywords

- Characters
- Factorizable ribbon Hopf algebras
- Symmetric algebras
- Unimodular Hopf algebras

## ASJC Scopus subject areas

- Algebra and Number Theory