Computing of the number of right coideal subalgebras of

Abstract: In this paper we complete the classification of right coideal subalgebras containing all grouplike elements for the multiparameter version of the quantum group , . It is known that every such subalgebra has a triangular decomposition , where and are right coideal subalgebras of negative and positive quantum Borel subalgebras. We found a necessary and sufficient condition for the above triangular composition to be a right coideal subalgebra of in terms of the PBW-generators of the components. Furthermore, an algorithm is given that allows one to find an explicit form of the generators. Using a computer realization of that algorithm, we determined the number of different right coideal subalgebras that contain all grouplike elements for . If q has a finite multiplicative order , the classification remains valid for homogeneous right coideal subalgebras of the multiparameter version of the Lusztig quantum group (the Frobenius–Lusztig kernel of type ) in which case the total number of homogeneous right coideal subalgebras and the particular generators are the same. [Copyright &y& Elsevier]