Hopf cocycles associated to pointed and copointed deformations over S3

Abstract

We present an explicit description of the Hopf 2-cocycles involved in the classification of finite dimensional pointed and copointed Hopf algebras over the symmetric group on three letters. We determine which cocycles are exponentials of Hochschild 2-cocycles and which ones are pure.

19 pages. We have shortened some of the proofs via the use of GAP. As well, the overall presentation has been improved