Duals of pointed Hopf algebras

Abstract

This paper studies the duals of some finite dimensional pointed Hopf algebras, with abelian group of grouplikes, over an algebraically closed field of characteristic 0, which are either Radford biproducts or else nontrivial liftings of a biproduct.

Revised. Corrections made in column 6, rows 2,3 of the second table in Section 4. Results follow from Theorem 3.3 as claimed. References updated

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• Examples of pointed color Hopf algebras