Geodesic
On a Classification of Periodic Maps on the 2-Torus
Russian journal of nonlinear dynamics, Tome 19 (2023) no. 1, pp. 91-110

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In this paper, following J. Nielsen, we introduce a complete characteristic of orientation- preserving periodic maps on the two-dimensional torus. All admissible complete characteristics were found and realized. In particular, each of the classes of orientation-preserving periodic homeomorphisms on the 2-torus that are nonhomotopic to the identity is realized by an algebraic automorphism. Moreover, it is shown that the number of such classes is finite. According to V. Z. Grines and A. Bezdenezhnykh, any gradient-like orientation-preserving diffeomorphism of an orientable surface is represented as a superposition of the time-1 map of a gradient-like flow and some periodic homeomorphism. Thus, the results of this work are directly related to the complete topological classification of gradient-like diffeomorphisms on surfaces.
Keywords: gradient-like flows and diffeomorphisms on surfaces, periodic homeomorphisms, torus. 
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D. A. Baranov; V. Z. Grines; O. V. Pochinka; E. E. Chilina. On a Classification of Periodic Maps on the 2-Torus. Russian journal of nonlinear dynamics, Tome 19 (2023) no. 1, pp. 91-110. http://geodesic.mathdoc.fr/item/ND_2023_19_1_a5/