Cocycle deformations for Hopf algebras with a coalgebra projection

Alessandro Ardizzoni, Margaret Beattie, Claudia Menini

Let $H$ be a Hopf algebra over a field $K$ of characteristic $0$ and let $A$ be a bialgebra or Hopf algebra such that $H$ is isomorphic to a sub-Hopf algebra of $A$ and there is an…