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math.QA2019
Examples of liftings of modular and unidentified type: ufo(7,8) and br(2,a)
Agustín García Iglesias, Edwin Pacheco Rodríguez
We compute all liftings of braidings of unidentified types ufo(7) and ufo(8). Some of these examples had been previously computed by Helbig. We also present a list of examples of l…
math.QA2019
Hopf-Galois structures on ambiskew polynomial rings
Julien Bichon, Agustín García Iglesias
We provide necessary and sufficient conditions to extend the Hopf-Galois algebra structure on an algebra R to a generalized ambiskew ring based on R, in a way such that the added v…