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The unsolvability of the equality problem for sentential forms of context-free grammars. (English) Zbl 0273.68054


MSC:

68Q45 Formal languages and automata
03D05 Automata and formal grammars in connection with logical questions
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References:

[1] Lindenmayer, A., Mathematical models for cellular interaction in development I, II, J. theoret. biol., 18, 280-315, (1968)
[2] Lindenmayer, A., Developmental systems without interactions, their languages and grammars, J. theoret. biol., 30, 455-484, (1971)
[3] Herman, G.T., The computing ability of a developmental model for filamentous organisms, J. theoret. biol., 25, 421-435, (1969)
[4] van Dalen, D., A note on some systems of lindenmayer, Math. systems theory, 5, 128-140, (1971) · Zbl 0218.02031
[5] Rozenberg, G.; Doucet, P.G., On OL-languages, Information and control, 19, 302-318, (1971) · Zbl 0242.68052
[6] Bar-Hillel, Y.; Perles, M.; Shamir, E., On formal properties of simple phrasestructure grammars, Z. phonetik, sprachwiss, kommunikat., 14, 143-172, (1961) · Zbl 0106.34501
[7] Griffiths, T.V., The unsolvability of the equivalence problem for λ-free nondeterministic generalized machines, J. assoc. comput. Mach., 15, 409-413, (1968) · Zbl 0162.02302
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