We will consider the Generalized Chebyshev polynomials on the plane and show the existence of three equilibrium probabilities for the pressure associated with a distinguished value of an external parameter. The phenomena shows an intriguing analogy with the Potts Model of Statistical Mechanics. The main feature of this model is to explain the sudden magnetization of a Ferromagnetic system at a certain value of the temperature. In the Potts model three equilibrium measures coexist at the transition value. In our case two of these equilibrium probabilities have magnetic (or anti-ferromagnetic) nature, and the other one is not of magnetic nature. This phenomena can be classified as a triple point phase transition. For temperatures below this distinguished value, there exist just two equilibrium measures, namely the two magnetic and anti-ferromagnetic ones mentioned above Our main theorem is presented in §2, after we explain some properties of the dynamics of the Generalized Chebyshev Polynomials. The mathematical model presented here has a strong analogy with the phenomena of triple point transition in a semi-infinite one-dimensional spin-lattice N; with four spin-components in each sitte of the lattice. One should also suppose the existence of an anisotropy in the lattice in such way some of the spin-components (or directions) are not favorable. Some results related to Yang-Lee zeros are presented in the end of the paper. We refer the reader to the conclusion at the end of the paper for more comments about the above considerations.
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