Abstract
An alternative derivation of the relationship between bond percolation and the Ashkin-Teller-Potts model, discovered by Kastelyn and Fourtuin (1972), is presented. The derivation is in terms of a correlated bond expansion of standard form. A class of percolation models related to the general p-state model is defined, and a relationship between bond density and internal energy is derived. The nature of the p=1 percolation limit and its correlation function are also discussed.

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