Abstract
Since the famous construction of “the hardest context-free language” by Greibach (1973), the existence of hardest languages under homomorphic reductions has been investigated for quite a few language families. This paper shows that for one-way real-time cellular automata, also known as trellis automata, there is no hardest language, whereas for linear-time cellular automata, the hardest language is constructed.
Research supported by Russian Science Foundation, project 18-11-00100.
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Mrykhin, M., Okhotin, A. (2021). On Hardest Languages for One-Dimensional Cellular Automata. In: Leporati, A., Martín-Vide, C., Shapira, D., Zandron, C. (eds) Language and Automata Theory and Applications. LATA 2021. Lecture Notes in Computer Science(), vol 12638. Springer, Cham. https://doi.org/10.1007/978-3-030-68195-1_10
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