#### Title

Representations of semisimple Hopf algebras

#### Date of Award

2005

#### Degree Type

Dissertation

#### Degree Name

Doctor of Philosophy (PhD)

#### Department

Mathematics

#### Advisor(s)

Declan P. Quinn

#### Keywords

Hopf algebras, Drinfeld double, Semisimple

#### Subject Categories

Mathematics | Physical Sciences and Mathematics

#### Abstract

Let H be a cosemisimple Hopf algebra over an algebraically closed field. In the first chapter of the thesis, it is shown that if H has a simple subcoalgebra of dimension 9 and has no simple subcoalgebras of even dimension, then H contains either a grouplike element of order 2 or 3, or a family of simple subcoalgebras whose dimensions are the squares of each positive odd integer. In particular, if H is odd dimensional, then its dimension is divisible by 3.

In the second chapter, the induced representations from H and H * to the Drinfel'd double D ( H ) are studied. The product of two such representations is a sum of copies of the regular representation of D ( H ). The action of certain irreducible central characters of H * on the simple modules of H is considered. The modules that receive trivial action from each such irreducible central character are precisely the constituents of the tensor powers of the adjoint representation of H .

#### Access

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#### Recommended Citation

Burciu, Sebastian, "Representations of semisimple Hopf algebras" (2005). *Mathematics - Dissertations.* Paper 29.

http://surface.syr.edu/mat_etd/29

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