Abstract
In this article we study how a subshift can simulate another one, where the notion of simulation is given by operations on subshifts inspired by the dynamical systems theory (factor, projective subaction …). There exists a correspondence between the notion of simulation and the set of forbidden patterns. The main result of this paper states that any effective subshift of dimension d—that is a subshift whose set of forbidden patterns can be generated by a Turing machine—can be obtained by applying dynamical operations on a subshift of finite type of dimension d+1—a subshift that can be defined by a finite set of forbidden patterns. This result improves Hochman’s (Invent. Math. 176(1):131–167, 2009).
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Acknowledgements
The authors are grateful to Michael Schraudner for useful discussions and important remarks about the redaction. We also want to thank the anonymous referee for his rigorous and detailed review which helped us to clarify the paper and Mike Boyle for some comments about sub-action concepts. Moreover, this research is partially supported by projects ANR EMC and ANR SubTile.
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Aubrun, N., Sablik, M. Simulation of Effective Subshifts by Two-dimensional Subshifts of Finite Type. Acta Appl Math 126, 35–63 (2013). https://doi.org/10.1007/s10440-013-9808-5
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DOI: https://doi.org/10.1007/s10440-013-9808-5
Keywords
- Symbolic dynamics
- Multi-dimensional shifts of finite type
- Subaction
- Projective subaction
- Effectively closed subshifts
- Turing machines
- Substitutive subshifts