KINETIC-EQUATIONS IN THE METHOD OF 2-TIME FINITE-TEMPERATURE GREENS-FUNCTIONS .1. RENORMALIZATION OF THE COLLISION INTEGRAL

A system of equations that includes a generalized kinetic equation and equations for the static correlation functions is constructed for a n ormal quantum system of interacting Bose and Fermi particles with two- body interaction on the basis of the method of two-time finite-tempera ture Green's functions. The equations are in general valid for systems with arbitrary density of the particles. A method of successive appro ximation that makes it possible to go beyond the usual low-density exp ansion is discussed. The proposed method leads to a renormalization of the collision integral and makes it possible to obtain correlation fu nctions for the total energy density, including its potential part.