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2017

Cartan Subalgebras for Quantum Symmetric Pair Coideals

Letzter, Gail

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There is renewed interest in the coideal subalgebras used to form quantum symmetric pairs because of recent discoveries showing that they play a fundamental role in the representation theory of quantized enveloping algebras.

However, there is still no general theory of finite-dimensional modules for these coideals.
In this paper, we establish an important step in this direction: we show that every quantum symmetric pair coideal subalgebra admits a quantum Cartan subalgebra which is a polynomial ring that specializes to its classical counterpart.
The construction builds on Kostant and Sugiura's classification of Cartan subalgebras for real semisimple Lie algebras via strongly orthogonal systems of positive roots.

Cartan Subalgebras for Quantum Symmetric Pair Coideals · Around

Built on

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1955
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G. Lusztig,
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J.C. Jantzen,
1995
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1995
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M.S. Dijkhuizen,
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A.W. Knapp,
1996
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