2 Edward
نویسندگان
چکیده
We study nite centralizing extensions A H of Noetherian Hopf algebras. Our main results provide necessary and suucient conditions for the bers of the surjection spec H spec A to coincide with the X-orbits in spec H, where X denotes the nite group of characters of H that restrict to the counit of A. In particular, all of the bers are X-orbits if and only if the ber over the augmentation ideal of A is an X-orbit. An application to the representation theory of quantum function algebras, at roots of unity, is presented.
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