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Induction in formal languages. Some properties of reducing transformations and of isolable sets. (English) Zbl 0135.25201


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[1] D. G. Cantor: On the Ambiguity Problem of Backus Systems. J. Assoc. Comp. Mach. 9 (1962), 477-479. · Zbl 0114.33003 · doi:10.1145/321138.321145
[2] Noam Chomsky, M. P. Schützenberger: The Algebraic Theory of Contex-free Languages. Computer Programming and Formal Systems. (ed. by P. Braffort and D. Hirschberg), Amsterdam 1963.
[3] Václav Fabian: Structural Unambiguity of Formal Languages. Czechoslovak Math. J. 14 (89) (1964), 394-430 · Zbl 0278.68062
[4] Sheita A. Greibach: The Undecidability of the Ambiguity Problem for Minimal Linear Grammars. Information and Control 6 (1963) 119-125. · Zbl 0115.37007 · doi:10.1016/S0019-9958(63)90149-9
[5] Jozef Gruska: On Structural Unambiguity of Formal Languages. Czechoslovak Math. J. 15 (90) (1965), 283-294. · Zbl 0133.25503
[6] J. Gruska: Isolable and Weakly Isolable Sets. · Zbl 0143.25604
[7] J. Gruska: Structural Unambiguity of ALGOL-MOD. · Zbl 0139.00802
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