Classification of U_q(sl_2)-module algebra structures on the quantum plane
arXiv:0905.1719
Abstract
A complete list of Uq(sl2)-module algebra structures on the quantum plane is produced and the (uncountable family of) isomorphism classes of these structures are described. The composition series of representations in question are computed. The classical limits of the Uq(sl2)-module algebra structures are discussed.
21 pages, amsart. The assumption 0<q<1 on deformation parameter is replaced by the less restrictive assumption that q is not a root of 1. References added