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International Conference on Developments in Language Theory

DLT 2017: Developments in Language Theory pp 75–79Cite as

Connecting Decidability and Complexity for MSO Logic

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Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 10396))

Abstract

This work is about studying reasons for (un)decidability of variants of Monadic Second-order (mso) logic over infinite structures. Thus, it focuses on connecting the fact that a given theory is (un)decidable with certain measures of complexity of that theory.

The first of the measures is the topological complexity. In that case, it turns out that there are strong connections between high topological complexity of languages available in a given logic, and its undecidability. One of the milestone results in this context is the Shelah’s proof of undecidability of mso over reals.

The second complexity measure focuses on the axiomatic strength needed to actually prove decidability of the given theory. The idea is to apply techniques of reverse mathematics to the classical decidability results from automata theory. Recently, both crucial theorems of the area (the results of Büchi and Rabin) have been characterised in these terms. In both cases the proof gives strong relations between decidability of the mso theory with concepts of classical mathematics: determinacy, Ramsey theorems, weak Konig’s lemma, etc.

The author was supported by the Polish National Science Centre grant no. UMO-2016/21/D/ST6/00491.

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Notes

  1. 1.

    A posteriori, the considered set Q needs to violate Baire Property.

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Author information

Authors and Affiliations

  1. University of Warsaw, Banacha 2, Warsaw, Poland

    Michał Skrzypczak

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  1. Michał Skrzypczak
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Correspondence to Michał Skrzypczak .

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Editors and Affiliations

  1. Université de Liège, Liège, Belgium

    Émilie Charlier

  2. Université de Liège, Liège, Belgium

    Julien Leroy

  3. Université de Liège, Liège, Belgium

    Michel Rigo

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Skrzypczak, M. (2017). Connecting Decidability and Complexity for MSO Logic. In: Charlier, É., Leroy, J., Rigo, M. (eds) Developments in Language Theory. DLT 2017. Lecture Notes in Computer Science(), vol 10396. Springer, Cham. https://doi.org/10.1007/978-3-319-62809-7_4

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  • DOI: https://doi.org/10.1007/978-3-319-62809-7_4

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