sentences:  The problem about the appearance of a stochastic process in a dynamical system which is submitted to the influence of a "large" system was considered in notable paper, in the approach of the nonequilibrium statistical operator.The derivation of the equation which describes approximately the evolution of the state of the dynamic system interacting with the thermal bath was given.The Equation derived can be called a Schroedinger-type equation with damping for a dynamical system in a thermal bath.