Journal of Zhejiang University-SCIENCE A

, Volume 7, Issue 6, pp 1077–1083 | Cite as

Almost split sequences for symmetric non-semisimple Hopf algebras

  • Shi Mei-hua 


We first prove that for a finite dimensional non-semisimple Hopf algebra H, the trivial H-module is not projective and so the almost split sequence ended with k exists. By this exact sequence, for all indecomposable H-module X, we can construct a special kind of exact sequence ending with it. The main aim of this paper is to determine when this special exact sequence is an almost split one. For this aim, we restrict H to be unimodular and the square of its antipode to be an inner automorphism. As a special case, we give an application to the quantum double D(H)=(Hop)*⋈H) of any non-semisimple Hopf algebra.

Key words

Indecomposable Unimodular Almost split sequences Symmetric non-semisimple Hopf algebras 

CLC number



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Copyright information

© Zhejiang University 2006

Authors and Affiliations

  • Shi Mei-hua 
    • 1
  1. 1.Department of MathematicsZhejiang Education InstituteHangzhouChina

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