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Periodic points for onto cellular automata. (English) Zbl 1024.37007
Summary: Let $$\varphi$$ be a one-dimensional surjective cellular automaton map. We prove that if $$\varphi$$ is a closing map, then the configurations which are both spatially and temporally periodic are dense. (If $$\varphi$$ is not a closing map, then we do not know whether the temporally periodic configurations must be dense.) The results are special cases of results for shifts of finite type, and the proofs use symbolic dynamical techniques.

##### MSC:
 37B15 Dynamical aspects of cellular automata 37B10 Symbolic dynamics 54H20 Topological dynamics (MSC2010) 68Q80 Cellular automata (computational aspects)
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