Abstract
The reversing symmetry group is a well-studied extension of the symmetry group of a dynamical system, the latter being defined by the action of a single homeomorphism on a topological space. While it is traditionally considered in nonlinear dynamics, where the space is simple but the map is complicated, it has an interesting counterpart in symbolic dynamics, where the map is simple but the space is not. Moreover, there is an interesting extension to the case of higher-dimensional shifts, where a similar concept can be introduced via the centraliser and the normaliser of the acting group in the full automorphism group of the shift space. We recall the basic notions and review some of the known results, in a fairly informal manner, to give a first impression of the phenomena that can show up in the extension from the centraliser to the normaliser, with some emphasis on recent developments.
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Acknowledgements
A substantial part of this exposition is based on a joint work (both past and ongoing) with John Roberts, who introduced me to the concepts over 25 years ago. More recent activities also profited a lot from the interaction and cooperation with Christian Huck, Mariusz Lemańczyk and Reem Yassawi. It is a pleasure to thank the CIRM in Luminy for its support and the stimulating atmosphere during the special program in the framework of the Jean Morlet semester ‘Ergodic Theory and Dynamical Systems in their Interactions with Arithmetic and Combinatorics’, where part of this work was done.
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Baake, M. (2018). A Brief Guide to Reversing and Extended Symmetries of Dynamical Systems. In: Ferenczi, S., Kułaga-Przymus, J., Lemańczyk, M. (eds) Ergodic Theory and Dynamical Systems in their Interactions with Arithmetics and Combinatorics. Lecture Notes in Mathematics, vol 2213. Springer, Cham. https://doi.org/10.1007/978-3-319-74908-2_9
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