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math.QA2003★ 79 cited
Central Invariants and Frobenius-Schur Indicators for Semisimple Quasi-Hopf Algebras
Geoffrey Mason, Siu-Hung Ng
In this paper, we obtain a canonical central element for each semi-simple quasi-Hopf algebra over any field and prove that is invariant under gauge transformati…
math.QA2001
Non-semisimple Hopf Algebras of Dimension p^2
Siu-Hung Ng
Let H be a Hopf algebra of dimension pq over an algebraically closed field of characteristic 0, where p <= q are odd primes. Suppose that S is the antipode of H. If H is not semisi…