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math.RA2001
Hopf algebra actions on strongly separable extensions of depth two
Lars Kadison, Dmitri Nikshych
We bring together ideas in analysis of Hopf *-algebra actions on II_1 subfactors of finite Jones index and algebraic characterizations of Frobenius, Galois and cleft Hopf extension…
math.RA2001
Frobenius extensions and weak Hopf algebras
Lars Kadison, Dmitri Nikshych
We study a symmetric Markov extension of k-algebras N \into M, a certain kind of Frobenius extension with conditional expectation that is tracial on the centralizer and dual bases…