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Substitution expressions. (English) Zbl 0229.68026


MSC:

68Q45 Formal languages and automata

Software:

ALGOL 60
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Full Text: DOI

References:

[1] Arden, D.N., Delayed logic and finite state machines, (), 131-151
[2] Bar-Hillel, Y., ()
[3] Brzozowski, J.A., Regular-like expressions for some irregular languages, () · Zbl 0199.04501
[4] Eggan, L.C., Transition graphs and the star height of regular events, Michigan math. J., 10, 385-397, (1963) · Zbl 0173.01504
[5] Ginsburg, S.; Rice, H.C., Two families of languages related to ALGOL, J. assoc. comput. Mach., 9, 3, (1962) · Zbl 0161.13903
[6] Greibach, S., A new normal form theorem for context-free phase structure grammars, J. assoc. comput. Mach., 12, 42-52, (1965) · Zbl 0135.18404
[7] Greibach, S., Full AFLs and nested iterated substitution, Information and control, 16, 7-35, (1970) · Zbl 0188.03102
[8] {\scJ. Gruska}, A characterization of context-free languages, J. Comput. System Sci., to appear. · Zbl 0271.68057
[9] Hopcroft, J.E.; Ullman, J.D., ()
[10] Kral, J., A modification of a substitution theorem and some necessary and sufficient conditions for sets to be context-free, Math. systems theory, 4, 129-139, (1970) · Zbl 0199.31301
[11] McWhirter, I.P., ()
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