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The mapping of the critical points in the q-state model for q<or=4 onto the Baxter line in the eight-vertex model makes it possible, by a comparison of the exactly known critical exponent yT8v with the approximately known values for yTP, to conjecture the relation (yT8v-2)(yTP-3)=3. This relation confirms weak universality.
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M. P. M. den Nijs (1979) studied this question.
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