Expansivity and unique shadowing
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- by Chris Good, Sergio Macías, Jonathan Meddaugh, Joel Mitchell and Joe Thomas PDF
- Proc. Amer. Math. Soc. 149 (2021), 671-685 Request permission
Abstract:
Let $f\colon X\to X$ be a continuous function on a compact metric space. We show that shadowing is equivalent to backwards shadowing and two-sided shadowing when the map $f$ is onto. Using this we go on to show that, for expansive surjective maps the properties shadowing, two-sided shadowing, s-limit shadowing, and two-sided s-limit shadowing are equivalent. We show that $f$ is positively expansive and has shadowing if and only if it has unique shadowing (i.e., each pseudo-orbit is shadowed by a unique point), extending a result implicit in Walter’s proof that positively expansive maps with shadowing are topologically stable. We use the aforementioned result on two-sided shadowing to find an equivalent characterisation of shadowing and expansivity and extend these results to the notion of $n$-expansivity due to Morales.References
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Additional Information
- Chris Good
- Affiliation: School of Mathematics, University of Birmingham, Birmingham, B15 2TT, United Kingdom
- MR Author ID: 336197
- ORCID: 0000-0001-8646-1462
- Email: c.good@bham.ac.uk
- Sergio Macías
- Affiliation: Instituto de Matemáticas, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, México D.F., C.P. 04510, Mexico
- Email: sergiom@matem.unam.mx
- Jonathan Meddaugh
- Affiliation: Department of Mathematics, Baylor University, Waco, Texas 76798-7328
- MR Author ID: 799515
- Email: jonathan_meddaugh@baylor.edu
- Joel Mitchell
- Affiliation: Centre for Computational Biology, University of Birmingham, Birmingham, B15 2TT, United Kingdom
- MR Author ID: 1341863
- ORCID: 0000-0003-2659-8242
- Email: j.s.mitchell@bham.ac.uk
- Joe Thomas
- Affiliation: School of Mathematics, The University of Manchester, Manchester, M13 9PL, United Kingdom
- MR Author ID: 1353810
- ORCID: 0000-0001-5343-3676
- Email: joe.thomas-3@postgrad.manchester.ac.uk
- Received by editor(s): March 12, 2020
- Received by editor(s) in revised form: May 19, 2020
- Published electronically: November 25, 2020
- Additional Notes: The fourth author is the corresponding author.
- Communicated by: Katrin Gelfert
- © Copyright 2020 American Mathematical Society
- Journal: Proc. Amer. Math. Soc. 149 (2021), 671-685
- MSC (2010): Primary 37B05, 37C50
- DOI: https://doi.org/10.1090/proc/15204
- MathSciNet review: 4198074