Abstract
This paper shows that over infinite trees, satisfiability is decidable for weak monadic second-order logic extended by the unbounding quantifier \(\mathsf U\) and quantification over infinite paths. The proof is by reduction to emptiness for a certain automaton model, while emptiness for the automaton model is decided using profinite trees.
Full version of this paper with proofs is at arxiv.org/abs/1404.7278.
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Bojańczyk, M. (2014). Weak MSO+U with Path Quantifiers over Infinite Trees. In: Esparza, J., Fraigniaud, P., Husfeldt, T., Koutsoupias, E. (eds) Automata, Languages, and Programming. ICALP 2014. Lecture Notes in Computer Science, vol 8573. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-43951-7_4
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DOI: https://doi.org/10.1007/978-3-662-43951-7_4
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