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Descriptive theory of chaos
7.11.2019, 16:15 - 17:45
Speaker:Olexandr Mikolajowytsch Sharkovsky, Institute of Mathematics, NAS of Ukraine
Location:Mathematisches Institut, Bunsenstr 3-5SitzungszimmerGras Geo Map
Organizer:Fakultät für Mathematik und Informatik
Descriptive theory of sets is a classical section of mathematics, which arose at the beginning of the last century. The talk proposes the basis of the descriptive theory of
chaos. We consider dynamical systems on a compact X, generated by a continuous map f : X →X, mainly in the case of when X is an interval I ⊂R. The asymptotic behavior of every trajectory is usually determined through the so- called ω-limit set, or, more simply, the attractor of this trajectory. The set of all trajectories attracted by the same attractor is called the basin of this attractor.
Dynamical system if its topological entropy is positive :
1) has a lot of different attractors of trajectories, namely, the continuum of attractors;
2) basins of most attractors have a very complex structure, namely, they are sets of the 3rd class in the terminology of the descriptive theory of sets;
3) basins of different attractors are very intertwined and they can not be separated from each other by open or closed sets, but only by sets of the 2nd class of complexity, and
4) in the space of all closed subsets of the state space (with the Hausdorff metric), the set of all attractors is an attractor net (network) whose cells are formed by Cantor sets whose points are themselves attractors.
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