The Representation Ring and the Centre of a Hopf Algebra Academic Article uri icon


  • AbstractWhen H is a finite dimensional, semisimple, almost cocommutative Hopf algebra, we examine a table of characters which extends the notion of the character table for a finite group. We obtain a formula for the structure constants of the representation ring in terms of values in the character table, and give the example of the quantum double of a finite group. We give a basis of the centre of H which generalizes the conjugacy class sums of a finite group, and express the class equation of H in terms of this basis. We show that the representation ring and the centre of H are dual character algebras (or signed hypergroups).

published proceedings

  • Canadian Journal of Mathematics

author list (cited authors)

  • Witherspoon, S. J.

citation count

  • 8

complete list of authors

  • Witherspoon, Sarah J

publication date

  • August 1999