Variations of the firing squad problem and applications. (English) Zbl 0665.68043

We give minimal time solutions for a few modifications of he firing squad problem. As an application we disprove a conjecture by O. H. Ibarra and T. Jiang [SIAM J. Comput. 16, 1135-1154 (1987; Zbl 0646.68070)] that proposes a candidate for showing that the class of languages accepted in real-time by one-way cellular arrays (OCA) is not closed under concentration. We show that their candidate and also similar languages are accepted by OCA in real-time.


68Q80 Cellular automata (computational aspects)
68Q45 Formal languages and automata


Zbl 0646.68070
Full Text: DOI


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