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Probabilistic Regular Expressions and MSO Logic on Finite Trees

Author Thomas Weidner

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Thomas Weidner

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Thomas Weidner. Probabilistic Regular Expressions and MSO Logic on Finite Trees. In 35th IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 45, pp. 503-516, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015) https://doi.org/10.4230/LIPIcs.FSTTCS.2015.503

Abstract

We introduce probabilistic regular tree expressions and give a Kleene-like theorem for probabilistic tree automata (PTA). Furthermore, we define probabilistic MSO logic. This logic is more expressive than PTA. We define bottom-up PTA, which are strictly more expressive than PTA. Using bottom-up PTA, we prove a Büchi-like theorem for probabilistic MSO logic. We obtain a Nivat-style theorem as an additional result.

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Keywords
  • Probabilistic Regular Expressions
  • MSO Logic
  • Tree Automata

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