English

B\"uchi-like characterizations for Parikh-recognizable omega-languages

Formal Languages and Automata Theory 2023-02-09 v1

Abstract

B\"uchi's theorem states that ω\omega-regular languages are characterized as languages of the form iUiViω\bigcup_i U_i V_i^\omega, where UiU_i and ViV_i are regular languages. Parikh automata are automata on finite words whose transitions are equipped with vectors of positive integers, whose sum can be tested for membership in a given semi-linear set. We give an intuitive automata theoretic characterization of languages of the form UiViωU_i V_i^\omega, where UiU_i and ViV_i are Parikh-recognizable. Furthermore, we show that the class of such languages, where UiU_i is Parikh-recognizable and ViV_i is regular is exactly captured by a model proposed by Klaedtke and Ruess [Automata, Languages and Programming, 2003], which again is equivalent to (a small modification of) reachability Parikh automata introduced by Guha et al. [FSTTCS, 2022]. We finish this study by introducing a model that captures exactly such languages for regular UiU_i and Parikh-recognizable ViV_i.

Cite

@article{arxiv.2302.04087,
  title  = {B\"uchi-like characterizations for Parikh-recognizable omega-languages},
  author = {Mario Grobler and Sebastian Siebertz},
  journal= {arXiv preprint arXiv:2302.04087},
  year   = {2023}
}
R2 v1 2026-06-28T08:35:05.304Z