Classical equilibrium generalized hydrodynamic correlation Green's functions for a system of hard balls with weak interaction

For a system of hard balls with weak interaction expressions are obtained in the 13- and 14-moment approximations for the classical equilibrium generalized hydrodynamic retarded Green's functions. Mean-field effects have been taken into account both directly and self-consistently. A system of hard balls and a system of weakly interacting particles are considered as special cases.