Normal Hopf subalgebras in cocycle deformations of finite groups

Cesar Galindo, Sonia Natale

Let $G$ be a finite group and let $\pi :G\to G^{\prime }$ be a surjective group homomorphism. Consider the cocycle deformation $L=H^{\sigma }$ of the Hopf algebra $H=k^G$ of $k$-valued linear fu…