Abstract
We consider subshifts and cellular automata in the setup where the state set is a finite group. The group does not need to be commutative. A subshift that is also a subgroup is called a group shift, and we call a cellular automaton on a group shift a group cellular automaton if it is also a group homomorphism. Group cellular automata generalize the much studied concept of additive cellular automata into non-commutative groups. The set of space-time diagrams of a group cellular automaton is a group shift, so we can apply classical results by Bruce Kitchens and Klaus Schmidt on group shifts to analyze group cellular automata. In particular, we can effectively construct the limit set and the trace subshifts of any group cellular automaton. We can then algorithmically decide many properties concerning the cellular automaton that are in general undecidable. The talk is based on a joint work with Pierre Béaur.
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Kari, J. (2022). Algorithms for Group Cellular Automata. In: Das, S., Martinez, G.J. (eds) Proceedings of First Asian Symposium on Cellular Automata Technology. ASCAT 2022. Advances in Intelligent Systems and Computing, vol 1425. Springer, Singapore. https://doi.org/10.1007/978-981-19-0542-1_2
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DOI: https://doi.org/10.1007/978-981-19-0542-1_2
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