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math.RT2020★ 29 cited
Universal K-matrices for quantum Kac-Moody algebras
Andrea Appel, Bart Vlaar
We introduce the notion of a cylindrical bialgebra, which is a quasitriangular bialgebra endowed with a universal K-matrix, i.e., a universal solution of a generalized reflecti…
math-ph2020★ 10 cited
A Q-operator for open spin chains I: Baxter's TQ relation
Bart Vlaar, Robert Weston
We construct a Q-operator for the open XXZ Heisenberg quantum spin chain with diagonal boundary conditions and give a rigorous derivation of Baxter's TQ relation. Key roles in the…