  A comparative analysis of two concepts aimed at microscopic substantiation of
thermodynamics and kinetics has been performed. The first concept is based on
the idea of microscopic reversibility of the dynamics of a system of particles,
while macroscopic irreversibility is of statistical origin. The second concept
is based on the idea of the initial microscopic irreversibility of dynamics,
one of the mechanisms of which is the relativistic retardation of interactions
between particles.
