A simple two-dimensional Potts model with vacancies is introduced. The phase transition between paramagnetic and ferromagnetic is located by simple symmetry arguments. It is shown that the transition has a continuous and a first-order segment, separated by a tricritical transition. The locus of the tricritical point is determined by a transformation of the partition sum into that of an O(n) model. At the tricritical point and at some of the critical points this Potts model is soluble. © 1991.
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