Conjugacy Classes, Class Sums and Character Tables for Hopf Algebras

Miriam Cohen, Sara Westreich

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We extend the notion of conjugacy classes and class sums from finite groups to semisimple Hopf algebras and show that the conjugacy classes are obtained from the factorization of H as irreducible left D(H)-modules. For quasitriangular semisimple Hopf algebras H, we prove that the product of two class sums is an integral combination of the class sums up to d -2 where d = dim H. We show also that in this case the character table is obtained from the S-matrix associated to D(H). Finally, we calculate explicitly the generalized character table of D(kS 3, which is not a character table for any group. It moreover provides an example of a product of two class sums which is not an integral combination of class sums.

Original languageEnglish
Pages (from-to)4618-4633
Number of pages16
JournalCommunications in Algebra
Issue number12
StatePublished - Dec 2011


  • Character algebras
  • Character table
  • Class sums
  • Conjugacy classes
  • S-matrix
  • Semisimple Hopf algebras


Dive into the research topics of 'Conjugacy Classes, Class Sums and Character Tables for Hopf Algebras'. Together they form a unique fingerprint.

Cite this