Isomorphism classes and automorphisms of finite Hopf algebras of type A_n

Details Isomorphism classes and automorphisms of finite Hopf algebras of type A_n Isomorphism classes and automorphisms of finite Hopf algebras of type A_n

2005-11-10

arxiv.org/abs/math/0511283v2

Mathematics

Quantum Algebra

25 pages. The second version is final, to appear in Proceedings of the XVI Coloquio Latinoamericano de Algebra (Colonia, Urugu

Scientific paper

In our previous paper math/0502157 we classified a large class of finite-dimensional pointed Hopf algebras up to isomorphism. However the following problem was left open for Hopf algebras of of type $A,D$ or $E_6$, that is whose Cartan matrix is connected and allows a non-trivial automorphism of the corresponding Dynkin diagram. In this case we described the isomorphisms between two such Hopf algebras with the same Cartan matrix only implicitly. The problem is whether it is possible to compute the isomorphisms in terms of the defining families of parameters. In the present paper we solve this problem for type $A$.

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