On the interrelation of motions of dynamical systems; [О взаимоотношении движений динамических систем]

In the earlier articles by the authors [A. P. Afanasiev, S. M. Dzyuba, “On new properties of recurrent motions and minimal sets of dynamical systems”, Russian Universities Reports. Mathematics, 26:133 (2021), 5-14] and [A. P. Afanasiev, S. M. Dzyuba, “New properties of recurrent motions and limit motions sets of dynamical systems”, Russian Universities Reports. Mathematics, 27:137 (2022), 5-15], there was actually established the interrelation of motions of dynamical systems in compact metric spaces. The goal of this paper is to extend these results to the case of dynamical systems in arbitrary metric spaces. Namely, let Σ be an arbitrary metric space. In this article, first of all, a new important property is established that connects arbitrary and recurrent motions in such a space. Further, on the basis of this property, it is shown that if the positive (negative) semitrajectory of some motion f(t, p) located in Σ is relatively compact, then ω - (α -) limit set of the given motion is a compact minimal set. It follows, that in the space Σ, any nonrecurrent motion is either positively (negatively) outgoing or positively (negatively) asymptotic with respect to the corresponding minimal set. © A. P. Afanas'ev, S. M. Dzyuba, 2022.