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On Complementation of Nondeterministic Finite Automata without Full Determinization

HOLÍK, L.; LENGÁL, O.; ŠTĚPKOVÁ, A.; MAJOR, J.; STREJČEK, J. On Complementation of Nondeterministic Finite Automata without Full Determinization. 25th International Symposium on Fundamentals of Computation Theory. Lecture Notes in Computer Science. Wroclaw: Springer Verlag, 2025. p. 221-237. ISBN: 978-3-032-04700-7.
Type
conference paper
Language
English
Authors
Holík Lukáš, doc. Mgr., Ph.D., DITS (FIT)
Lengál Ondřej, doc. Ing., Ph.D., DITS (FIT)
Major Juraj
Štěpková Adéla
Strejček Jan
Abstract

Complementation of finite automata is a basic operation used in numerous
applications. The standard way to complement a nondeterministic finite automaton
(NFA) is to transform it into an equivalent deterministic finite automaton (DFA)
and complement the DFA. The DFA can, however, be exponentially larger than the
corresponding NFA. In this paper, we study several alternative approaches to
complementation, which are based either on reverse powerset construction or on
two novel constructions that exploit a commonly occurring structure of NFAs. Our
experiment on a large data set shows that using a different than the classical
approach can, in many cases, yield significantly smaller complements.

Keywords

nondeterministic finite automaton,NFA,complementation, determinization,component

URL
Published
2025
Pages
221–237
Journal
Lecture Notes in Computer Science, vol. 16106, ISSN
Proceedings
25th International Symposium on Fundamentals of Computation Theory
Conference
25th International Symposium on Fundamentals of Computation Theory --- FCT'25
ISBN
978-3-032-04700-7
Publisher
Springer Verlag
Place
Wroclaw
DOI
BibTeX
@inproceedings{BUT198409,
  author="Lukáš {Holík} and Ondřej {Lengál} and  {} and  {} and  {} and  {} and  {} and  {}",
  title="On Complementation of Nondeterministic Finite Automata without Full Determinization",
  booktitle="25th International Symposium on Fundamentals of Computation Theory",
  year="2025",
  journal="Lecture Notes in Computer Science",
  volume="16106",
  pages="221--237",
  publisher="Springer Verlag",
  address="Wroclaw",
  doi="10.1007/978-3-032-04700-7\{_}17",
  isbn="978-3-032-04700-7",
  issn="0302-9743",
  url="https://link.springer.com/chapter/10.1007/978-3-032-04700-7_17"
}
Projects
Efficient Finite Automata for Automated Reasoning, MŠMT, ERC CZ, LL1908, start: 2020-01-01, end: 2024-12-31, completed
Reliable, Secure, and Intelligent Computer Systems, BUT, Vnitřní projekty VUT, FIT-S-23-8151, start: 2023-03-01, end: 2026-02-28, running
Representing Boolean Functions by a Self-Adaptable Data Structure, GACR, Standardní projekty, GA23-07565S, start: 2023-01-01, end: 2025-12-31, completed
String Constraints for Security Analysis, GACR, Standardní projekty, 25-17934S, start: 2025-08-01, end: 2028-07-31, running
Research groups
Departments
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