# Simple Hopf algebras and deformations of finite groups

### Abstract

We show that certain twisting deformations of a family of supersolvable groups are simple as Hopf algebras. These groups are direct products of two generalized dihedral groups. Examples of this construction arise in dimensions 60 and $p^2q^2$, for prime numbers $p$,$q$ with $q|p−1$. We also show that certain twisting deformation of the symmetric group is simple as a Hopf algebra. On the other hand, we prove that every twisting deformation of a nilpotent group is semisolvable. We conclude that the notions of simplicity and (semi)solvability of a semisimple Hopf algebra are not determined by its tensor category of representations.

Publication
Math. Res. Lett. 14 (2007), no. 6, 943–954
##### César Galindo
###### Associate Professor of Mathematics

My research interests include representation theory, category theory and their applications to Mathematical-Physics.