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We obtain the structure theorem for -Hopf bimodules over Hopf algebroids, where H is the total algebra of the Hopf algebroid . Based on this theorem, we investigate the structure theorem for comodule algebras over Hopf algebroids.

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Acta Mathematica Hungarica
Authors: Daniel Ceretto, Esther García and Miguel Gómez Lozano

. 58 261 – 272 10.1007/BF01903956 . [2] Cohen , M. Montgomery , S. 1984 Group-graded rings, smash products, and group

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