Kurodin normalni oblik
From Wikipedia, the free encyclopedia
U računarstvu, formalna gramatika je u Kurodinom normalnom obliku ako i samo ako ima sve produkcije oblika:
- AB → CD ili
- A → BC ili
- A → B ili
- A → α
pri čemu su A, B, C i D nezavršni znakovi i α je završni znak.
Svaka gramatika u Kurodinom normalnom obliku generiše kontekstno zavisni jezik i obrnuto, svaki kontekstno ovisni jezik koji ne generiše prazni niz se može izgenerisati gramatikom u Kurodinom normalnom oblku.
- S.-Y. Kuroda, Classes of languages and linear-bounded automata, Information and Control 7(2): 207–223, juni 1964.
- Sige-Yuki Kuroda (juni 1964). "Classes of languages and linear-bounded automata" (PDF). Information and Control. 7 (2): 207–223. doi:10.1016/S0019-9958(64)90120-2.
- G. Révész, “Comment on the paper ‘Error detection in formal languages,’” Journal of Computer and System Sciences, vol. 8, no. 2, pp. 238–242, Apr. 1974. doi:10.1016/S0022-0000(74)80057-7 (Révész' trick)
- Penttonen, Martti (august 1974). "One-sided and two-sided context in formal grammars" (PDF). Information and Control. 25 (4): 371–392. doi:10.1016/S0019-9958(74)91049-3.
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