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A characterization of the reversibility of linear cellular automata

arXiv.org
A characterization of the reversibility of linear cellular automata
Let $G$ be a group, let $\mathbb{K}$ be a field, and let $V$ be a $\mathbb{K}$-vector space. We prove that there exists a bijective linear cellular automaton $V^G\to V^G$ whose inverse is not a cellular automaton if and only if $G$ is not locally finite and $\dim_{\mathbb{K}}V \geq |\mathbb{K}|^{\aleph_0}$. This answers an open problem proposed by T. Ceccherini-Silberstein and M. Coornaert.

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