Right coideal subalgebras in U^+_q(so_{2n+1})

Details Right coideal subalgebras in U^+_q(so_{2n+1}) Right coideal subalgebras in U^+_q(so_{2n+1})

2009-08-28

arxiv.org/abs/0908.4235v1

Mathematics

Quantum Algebra

53 pages

Scientific paper

We give a complete classification of right coideal subalgebras that contain all group-like elements for the quantum group $U_q^+(\frak{so}_{2n+1}),$ provided that $q$ is not a root of 1. If $q$ has a finite multiplicative order $t>4,$ this classification remains valid for homogeneous right coideal subalgebras of the small Lusztig quantum group $u_q^+(\frak{so}_{2n+1}).$ As a consequence, we determine that the total number of right coideal subalgebras that contain the coradical equals $(2n)!!,$ the order of the Weyl group defined by the root system of type $B_n.$

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