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math.QA2018★ 2 cited
Non-existence of Hopf orders for a twist of the alternating and symmetric groups
Juan Cuadra, Ehud Meir
We prove the non-existence of Hopf orders over number rings for two families of complex semisimple Hopf algebras. They are constructed as Drinfel'd twists of group algebras for the…
math.QA2018
Hopf cocycle deformations and invariant theory
Ehud Meir
For a given finite dimensional Hopf algebra we describe the set of all equivalence classes of cocycle deformations of as an affine variety, using methods of geometric invar…