Detail publikace
Phrase-Structure Grammars: Normal Forms and Reduction
KŘIVKA, Z. MEDUNA, A. ZEMEK, P.
Originální název
Phrase-Structure Grammars: Normal Forms and Reduction
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
angličtina
Originální abstrakt
This paper establishes two new normal forms for phrase-structure grammars in which both context-free rules and non-context-free rules are in prescribed forms. In addition, a limit is placed on the number of context-free rules. More specifically, the first form has 2 + n context-free rules, where n is the number of terminals. Concerning non-context-free rules, each of them has the form AB -> CD, where A, B, C, D are nonterminals. The second normal form has always only two context-free rules---S -> S# and # -> e, where S is the start symbol, # is a nonterminal, and e is the empty string. Regarding non-context-free rules, each of them is of the form AB -> XD, where A, B, D are nonterminals and X is a nonterminal or a terminal.
Klíčová slova
formal languages, phrase-structure grammars, normal forms
Autoři
KŘIVKA, Z.; MEDUNA, A.; ZEMEK, P.
Vydáno
31. 1. 2016
ISSN
0010-4620
Periodikum
COMPUTER JOURNAL
Ročník
59
Číslo
8
Stát
Spojené království Velké Británie a Severního Irska
Strany od
1180
Strany do
1185
Strany počet
6
URL
BibTex
@article{BUT130900,
author="Zbyněk {Křivka} and Alexandr {Meduna} and Petr {Zemek}",
title="Phrase-Structure Grammars: Normal Forms and Reduction",
journal="COMPUTER JOURNAL",
year="2016",
volume="59",
number="8",
pages="1180--1185",
doi="10.1093/comjnl/bxw001",
issn="0010-4620",
url="https://www.fit.vut.cz/research/publication/9949/"
}
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