Detail publikace
Two Power-Decreasing Derivation Restrictions in Generalized Scattered Context Grammars
Originální název
Two Power-Decreasing Derivation Restrictions in Generalized Scattered Context Grammars
Anglický název
Two Power-Decreasing Derivation Restrictions in Generalized Scattered Context Grammars
Jazyk
en
Originální abstrakt
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.
Anglický abstrakt
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.
BibTex
@article{BUT48140,
author="Tomáš {Masopust} and Alexandr {Meduna} and Jiří {Šimáček}",
title="Two Power-Decreasing Derivation Restrictions in Generalized Scattered Context Grammars",
annote="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.",
address="NEUVEDEN",
booktitle="Acta Cybernetica",
chapter="48140",
edition="NEUVEDEN",
howpublished="print",
institution="NEUVEDEN",
journal="Acta Cybernetica",
number="4",
volume="18",
year="2008",
month="january",
pages="783--793",
publisher="NEUVEDEN",
type="journal article - other"
}