Abstract
In this work we consider the relationships between the classes of two-dimensional languages defined by deterministic on-line tessellation automata and by real time two-dimensional cellular automata with Moore and Von Neumann neighborhood. We generalize the result known for one-dimensional cellular automata to two-dimensional cellular automata with Von Neumann neighborhood: the class of real time cellular automata is closed under rotation of 180° if and only if real time cellular automata is equivalent to linear time cellular automata.
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