Dynamics of random chains of finite size with an infinite number of elements in $ {\mathbb R}^{2} $

A finite chain with infinitely many units within the stochastic dynamical model in $ {\mathbb R}^{2}$ is considered. The equation for the probability distribution density of chain lengths is constructed. This equation is a function of the parameter $t$ which stands for the time. This research is a sequel to work [1].