Note: An exact scaling relation for truncatable free energies of   polydisperse hard-sphere mixtures
  A theoretical model for polydisperse systems of hard spheres is said to be truncatable when the excess free energy depends on the size distribution through a finite number $K$ of moments. This Note proves an exact scaling relation for truncatable free energies, which allows to reduce the effective degrees of freedom to $K-2$ independent combinations of the moments. 
Andr\'es Santos
cond-mat.soft cond-mat.stat-mech physics.chem-ph