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Differential renormalization equation for the q-state Potts model are proposed, and the critical behavior of the model near q=q₂ discussed. The equations give rise to critical and tricritical fixed points which merge at q=q₂ when a dilution field becomes marginal, to an essential singularity in the latent heat as a function of q=q₂, in accordance with the exact result of Baxter, and, for q=q₂, to a logarithm correction to the power-law behavior of the free energy as a function of T-T₂.
Nauenberg et al. (Mon,) studied this question.
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