Homogeneous right coideal subalgebras of quantized enveloping algebras

Details Homogeneous right coideal subalgebras of quantized enveloping algebras Homogeneous right coideal subalgebras of quantized enveloping algebras

2011-09-19

arxiv.org/abs/1109.3986v1

Mathematics

Quantum Algebra

13 pages

Scientific paper

For a quantized enveloping algebra of a complex semisimple Lie algebra with deformation parameter not a root of unity, we classify all homogeneous right coideal subalgebras. Any such right coideal subalgebra is determined uniquely by a triple consisting of two elements of the Weyl group and a subset of the set of simple roots satisfying some natural conditions. The essential ingredients of the proof are the Lusztig automorphisms and the classification of homogeneous right coideal subalgebras of the Borel Hopf subalgebras of quantized enveloping algebras obtained previously by H.-J. Schneider and the first named author. Key words: Quantum groups, coideal subalgebras, Weyl group, weak order

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