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A method employed by Morita for the approximate calculation of the free energy and pair distribution function of classical fluids is seen to be identical with the nodal expansion method. The limit of the nodal expansion sequence results-in an approximate integral equation for the potential of average force. This convolution appro:rimatioJl is seen to be consistent with the Ornstein-Zernike theory of fluids, and thus provides a convenient means for investigating the behavior of fluids near thedoi:10.1143/ptp.24.588 fatcat:3xpyv7xrybbfzcqkpmq6p7n3z4