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On proving that certain languages are not ETOL. (English) Zbl 0349.68034


MSC:

68Q45 Formal languages and automata
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[1] Ehrenfeucht, A., Rozenberg, G.: Nonterminals versus homomorphisms in defining languages for some classes of rewriting systems. Acta Informatica 4, 87-106 (1974) · Zbl 0313.68062
[2] Ginsburg, S.: The mathematical theory of context-free languages. New York: Me Graw-Hill 1966 · Zbl 0184.28401
[3] Herman, G. T., Rozenberg, G.: Developmental systems and languages. Amsterdam: North-Holland 1975 · Zbl 0306.68045
[4] Lindenmayer, A.: Mathematical models for cellular interactions in development. J. Theoretical Biology 18, 280-315 (1968)
[5] Lindenmayer, A., Rozenberg, G.: Developmental systems and languages. Proc. 4th Annual ACM Symposium on Theory of Computing, Denver (Colo.) 1972 · Zbl 0353.68087
[6] Rozenberg, G.: Direction controlled programmed grammars. Acta Informatica 1, 242-252 (1972) · Zbl 0244.68037
[7] Rozenberg, G.: Extension of tabled OL systems and languages. Internat. J. Computer and Information Sciences 2, 311-336 (1973) · Zbl 0293.68065
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