Atsuo Kuniba, Masato Okado
Soibelman's theory of quantized function algebra A_q(SL_n) provides a representation theoretical scheme to construct a solution of the Zamolodchikov tetrahedron equation. We extend this idea originally due to Kapranov and Voevodsky to A_q(Sp_{2n}) and obtain the intertwiner K corresponding to the quartic Coxeter relation. Together with the previously known 3-dimensional (3D) R matrix, the K satisfies a 3D analogue of the reflection equation which turns out to be a matrix version of the one proposed by Isaev and Kulish. It is shown that matrix elements of R and K are polynomials in q and that there are combinatorial and birational counterparts for R and K. The combinatorial ones arise either at q=0 or by ultradiscretization of the birational ones. A conjectural description for the type B and F_4 cases is also given.
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http://arxiv.org/abs/1208.1586
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