Redlich-Kister

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ln(γ_i) = summation from j=1 to 3 of [summation from n=1 to N of[x_j × A_ijn × (x_i - x_j)^{n - 2} × (n × x_i - x_j)] - 1 / 2 × summation from k=1 to 3 of [summation from n=1 to N of [x_j × x_k × a_jkn × (x_j - x_k)^{n - 2} × {(2 × n - 1) × x_j - x_k}]]]