A comment on the Kirkwood-Monroe theory of freezing

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Abstract
We establish the condition under which the broken symmetry equation of Lovett-Mou-Buff and Wertheim is equivalent to the first Yvon-Born-Green equation. On this basis we show that the Kirkwood-Monroe theory of freezing is missing a term related to the density derivative of the pair correlation function. This may explain the bad results obtained from the latter theory.