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On the irregular points for systems with the shadowing property

Published online by Cambridge University Press:  14 March 2017

YIWEI DONG
Affiliation:
School of Mathematical Science, Fudan University, Shanghai 200433, PR China email yiweidong@fudan.edu.cn, xuetingtian@fudan.edu.cn
PIOTR OPROCHA
Affiliation:
AGH University of Science and Technology, Faculty of Applied Mathematics, al. A. Mickiewicza 30, 30-059 Kraków, PolandNational Supercomputing Centre IT4Innovations, Division of the University of Ostrava, Institute for Research and Applications of Fuzzy Modeling, 30 dubna 22, 70103 Ostrava, Czech Republic email oprocha@agh.edu.pl
XUETING TIAN
Affiliation:
School of Mathematical Science, Fudan University, Shanghai 200433, PR China email yiweidong@fudan.edu.cn, xuetingtian@fudan.edu.cn
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Abstract

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We prove that when $f$ is a continuous self-map acting on a compact metric space $(X,d)$ that satisfies the shadowing property, then the set of irregular points (i.e., points with divergent Birkhoff averages) has full entropy. Using this fact, we prove that, in the class of $C^{0}$-generic maps on manifolds, we can only observe (in the sense of Lebesgue measure) points with convergent Birkhoff averages. In particular, the time average of atomic measures along orbits of such points converges to some Sinai–Ruelle–Bowen-like measure in the weak$^{\ast }$ topology. Moreover, such points carry zero entropy. In contrast, irregular points are non-observable but carry infinite entropy.

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Type
Original Article
Copyright
© Cambridge University Press, 2017