Quantum symmetries of faces models and the double triangle algebra
arXiv:hep-th/0501140
Abstract
Symmetries of trigonometric integrable two dimensional statistical face models are considered. The corresponding symmetry operators on the Hilbert space of states of the quantum version of these models define a weak *-Hopf algebra isomorphic to the Ocneanu double triangle algebra.
28 pages, 4 figures, new typesetting and a few corrections