George Szeto, Lianyong Xue, "On Hopf Galois Hirata extensions", International Journal of Mathematics and Mathematical Sciences, vol. 2003, Article ID 938514, 7 pages, 2003. https://doi.org/10.1155/S0161171203303357
On Hopf Galois Hirata extensions
Let be a finite-dimensional Hopf algebra over a field , the dual Hopf algebra of , and a right -Galois and Hirata separable extension of . Then is characterized in terms of the commutator subring of in and the smash product . A sufficient condition is also given for to be an -Galois Azumaya extension of .
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