On coideal subalgebras of cocentral Kac algebras and a generalization of Wall's conjecture

Abstract

It shown that any coideal subalgebra of a finite dimensional Hopf algebra is a cyclic module over the dual Hopf algebra. Using this we describe all coideal subalgebras of a cocentral abelian extension of Hopf algebras extending some results from [4].

15 pages

References in corpus (1)

• On a subfactor generalization of Wall's conjecture