An expression is developed forP/kTfor a multihyphen;component lattice gas with an arbitrary lattice as a multiple power series in a set ofkth nearesthyphen;neighbor interaction parameters, lgr;a bk, whereaandbindex the components, with the coefficients functions of the activity setz.By straightforward differentiation, corresponding expressions are obtained for other thermodynamic variables, and also for the probability of finding a pair of particles of specified components on a pair of specified sites. A transformation is outlined which permits the substitution of the number density setrgr;for the activity set as independent variables.
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