Masopust Tomáš and Meduna Alexander and Šimácek Jiří: Two power-decreasing derivation restrictions in generalized scattered context grammars. In: Acta cybernetica, (18) 4. pp. 783-793. (2008)
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Abstract
The present paper introduces and discusses generalized scattered context grammars that are based upon sequences of productions whose left-hand sides are formed by nonterminal strings, not just single nonterminals. It places two restrictions on the derivations in these grammars. More specifically, let k be a positive integer. The first restriction requires that all rewritten symbols occur within the first k symbols of the first continuous block of nonterminals in the sentential form during every derivation step. The other restriction defines derivations over sentential forms containing no more than k occurrences of nonterminals. As its main result, the paper demonstrates that both restrictions decrease the generative power of these grammars to the power of context-free grammars.
| Item Type: | Article |
|---|---|
| Heading title: | Regular papers |
| Journal or Publication Title: | Acta cybernetica |
| Date: | 2008 |
| Volume: | 18 |
| Number: | 4 |
| ISSN: | 0324-721X |
| Page Range: | pp. 783-793 |
| Language: | English |
| Place of Publication: | Szeged |
| Related URLs: | http://acta.bibl.u-szeged.hu/38526/ |
| Uncontrolled Keywords: | Számítástechnika, Kibernetika |
| Additional Information: | Bibliogr.: p. 792-793. ; összefoglalás angol nyelven |
| Subjects: | 01. Natural sciences 01. Natural sciences > 01.02. Computer and information sciences |
| Date Deposited: | 2016. Oct. 15. 12:25 |
| Last Modified: | 2022. Jun. 16. 15:20 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/12847 |
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