The Ornstein-Zernike equations for mixtures (MOZ) of monomers with coincident oligomers (coincident dimers, trimers,...,n-mers).
Since all oligomers are at infinite dilution, the OZ's for all are decoupled. The first member is for the bulk monomer fluid a (with size and energy )
For a coincident dimer () of size and energy at infinite dilution in the bulk a-monomers:
For a coincident trimer () of size and energy at infinite dilution in the bulk a-monomers: