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Low-temperature expansions are obtained for the three-state Potts model on the checkerboard lattice. The four Boltzmann weights were set to various integer multiples of a low-temperature variable x. The series were evaluated to order x 19 but it was found that the conjectured S 4 symmetry failed at order x 14 for the zero-field partition function, the spontaneous magnetisation and the zero-field susceptibility.
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I. G. Enting (1987) studied this question.
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