Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy

Purpose. The purpose of this study is to consider the class of Morse – Smale flows on surfaces, to characterize its subclass consisting of flows with a finite number of moduli of stability, and to obtain a topological classification of such flows up to topological conjugacy, that is, to fi...

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Autores principales:	Kruglov, Vladislav Evgenievich, Pochinka, Olga Vitalievna
Formato:	article
Lenguaje:	EN RU
Publicado:	Saratov State University 2021
Materias:	morse – smale flow moduli of stability equipped graph topological classification Physics QC1-999
Acceso en línea:	https://doaj.org/article/1bfbda1f019c448fba2d121e1249c303
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spelling	oai:doaj.org-article:1bfbda1f019c448fba2d121e1249c3032021-11-30T10:43:56ZClassification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy0869-66322542-190510.18500/0869-6632-2021-29-6-835-850https://doaj.org/article/1bfbda1f019c448fba2d121e1249c3032021-11-01T00:00:00Zhttps://andjournal.sgu.ru/sites/andjournal.sgu.ru/files/text-pdf/2021/11/kruglov-pochinka_835-850.pdfhttps://doaj.org/toc/0869-6632https://doaj.org/toc/2542-1905Purpose. The purpose of this study is to consider the class of Morse – Smale flows on surfaces, to characterize its subclass consisting of flows with a finite number of moduli of stability, and to obtain a topological classification of such flows up to topological conjugacy, that is, to find an invariant that shows that there exists a homeomorphism that transfers the trajectories of one flow to the trajectories of another while preserving the direction of movement and the time of movement along the trajectories; for the obtained invariant, to construct a polynomial algorithm for recognizing its isomorphism and to construct the realisation of the invariant by a standard flow on the surface. Methods. Methods for finding moduli of topological conjugacy go back to the classical works of J. Palis, W. di Melo and use smooth flow lianerization in a neighborhood of equilibrium states and limit cycles. For the classification of flows, the traditional methods of dividing the phase surface into regions with the same behavior of trajectories are used, which are a modification of the methods of A. A. Andronov, E. A. Leontovich, and A. G. Mayer. Results. It is shown that a Morse – Smale flow on a surface has a finite number of moduli if and only if it does not have a trajectory going from one limit cycle to another. For a subclass of Morse – Smale flows with a finite number of moduli, a classification is done up to topological conjugacy by means of an equipped graph. Conclusion. The criterion for the finiteness of the number of moduli of Morse – Smale flows on surfaces is obtained. A topological invariant is constructed that describes the topological conjugacy class of a Morse – Smale flow on a surface with a finite number of modules, that is, without trajectories going from one limit cycle to another. Kruglov, Vladislav EvgenievichPochinka, Olga VitalievnaSaratov State Universityarticlemorse – smale flowmoduli of stabilityequipped graphtopological classificationPhysicsQC1-999ENRUИзвестия высших учебных заведений: Прикладная нелинейная динамика, Vol 29, Iss 6, Pp 835-850 (2021)
institution	DOAJ
collection	DOAJ
language	EN RU
topic	morse – smale flow moduli of stability equipped graph topological classification Physics QC1-999
spellingShingle	morse – smale flow moduli of stability equipped graph topological classification Physics QC1-999 Kruglov, Vladislav Evgenievich Pochinka, Olga Vitalievna Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
description	Purpose. The purpose of this study is to consider the class of Morse – Smale flows on surfaces, to characterize its subclass consisting of flows with a finite number of moduli of stability, and to obtain a topological classification of such flows up to topological conjugacy, that is, to find an invariant that shows that there exists a homeomorphism that transfers the trajectories of one flow to the trajectories of another while preserving the direction of movement and the time of movement along the trajectories; for the obtained invariant, to construct a polynomial algorithm for recognizing its isomorphism and to construct the realisation of the invariant by a standard flow on the surface. Methods. Methods for finding moduli of topological conjugacy go back to the classical works of J. Palis, W. di Melo and use smooth flow lianerization in a neighborhood of equilibrium states and limit cycles. For the classification of flows, the traditional methods of dividing the phase surface into regions with the same behavior of trajectories are used, which are a modification of the methods of A. A. Andronov, E. A. Leontovich, and A. G. Mayer. Results. It is shown that a Morse – Smale flow on a surface has a finite number of moduli if and only if it does not have a trajectory going from one limit cycle to another. For a subclass of Morse – Smale flows with a finite number of moduli, a classification is done up to topological conjugacy by means of an equipped graph. Conclusion. The criterion for the finiteness of the number of moduli of Morse – Smale flows on surfaces is obtained. A topological invariant is constructed that describes the topological conjugacy class of a Morse – Smale flow on a surface with a finite number of modules, that is, without trajectories going from one limit cycle to another.
format	article
author	Kruglov, Vladislav Evgenievich Pochinka, Olga Vitalievna
author_facet	Kruglov, Vladislav Evgenievich Pochinka, Olga Vitalievna
author_sort	Kruglov, Vladislav Evgenievich
title	Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
title_short	Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
title_full	Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
title_fullStr	Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
title_full_unstemmed	Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
title_sort	classification of the morse – smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy
publisher	Saratov State University
publishDate	2021
url	https://doaj.org/article/1bfbda1f019c448fba2d121e1249c303
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Classification of the Morse – Smale flows on surfaces with a finite moduli of stability number in sense of topological conjugacy

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