  At the beginning of 1930-s A. N. Kolmogorov has published three papers on
analytical methods for the probability theory. The two-page work had the
essence of the approach started by A. Einstein and developed further by Fokker
and Planck. He proposed a fundamental solution for evolution description of the
6D vector of the probability distribution at the Markov character of action
which in modern terms is usually called as time delta-correlated acceleration.
This is an approximation of processes when correlation time of random forces is
much smaller than the reaction time of the system in consideration.
