Publication detail

Phrase-Structure Grammars: Normal Forms and Reduction

KŘIVKA, Z. MEDUNA, A. ZEMEK, P.

Original Title

Phrase-Structure Grammars: Normal Forms and Reduction

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

formal languages, phrase-structure grammars, normal forms

Authors

KŘIVKA, Z.; MEDUNA, A.; ZEMEK, P.

Released

31. 1. 2016

ISBN

0010-4620

Periodical

COMPUTER JOURNAL

Year of study

59

Number

8

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1180

Pages to

1185

Pages count

6

URL

https://www.fit.vut.cz/research/publication/9949/

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/"
}