Let 𝔻m be the dihedral
group of order 2m with m = 4t, t ≥ 3. Given an algebraically closed field of
characteristic 0, we classify all finite-dimensional Nichols algebras over 𝔻m and all
finite-dimensional pointed Hopf algebras whose group of group-likes is 𝔻m, by means
of the lifting method. As a byproduct we obtain new examples of finite-dimensional
pointed Hopf algebras.
Keywords
pointed Hopf algebra, Nichols algebra, dihedral group