Abstract
Certain field theories have especially large regions of analyticity which allow computations which generically cannot be done. This phenomenon is especially pronounced in the chiral Potts model. We study here the perturbation theory for the general non-integrable chiral Potts model depending on two chiral angles and a strength parameter and show how the analyticity of the ground state energy and correlation functions dramatically increases when the angles and the strength parameter satisfy the integrability condition.
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