ISSN 2079-6900 (Print)
ISSN 2587-7496 (Online)

Middle Volga Mathematical Society Journal

DOI 10.15507/2079-6900.24.202201.21-30

Original article

ISSN 2079-6900 (Print)

ISSN 2587-7496 (Online)

MSC2020 37D20

Dynamical properties of direct products of discrete dynamical systems

M. K. Barinova, E. K. Shustova

National Research University «High School of Economics» (Nizhny Novgorod, Russian Federation)

Abstract. A natural way for creating new dynamical systems is to consider direct products of already known systems. The paper studies some dynamical properties of direct products of homeomorphisms and diffeomorphisms. In particular, authors prove that a chain-recurrent set of the direct product of homeomorphisms is a direct product of the chain-recurrent sets. Another result established in the paper is that the direct product of diffeomorphisms holds hyperbolic structure on the direct product of hyperbolic sets. It is known that if a diffeomorphism has a hyperbolic chain-recurrent set, then this mapping is $\Omega$-stable. Therefore, it follows from the results of the paper that the direct product of $\Omega$-stable diffeomorphisms is also $\Omega$-stable. Another question which is raised in the article concerns the existence of an energy function for the direct product of diffeomorphisms which already have such functions (recall that energy function is a smooth Lyapunov function whose set of critical points coincides with the chain-recurrent set of the system). Authors show that in this case the function can be found as a weighted sum of energy functions of initial diffeomorphisms.

Key Words: direct product, homeomorphism, diffeomorphism, hyperbolic set, chain recurrent set, energy function

For citation: M. K. Barinova, E. K. Shustova. Dynamical properties of direct products of discrete dynamical systems. Zhurnal Srednevolzhskogo matematicheskogo obshchestva. 24:1(2022), 21–30. DOI: https://doi.org/10.15507/2079-6900.24.202201.21-30

Submitted: 21.11.2021; Revised: 16.01.2022; Accepted: 24.02.2022