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On the Union Closed Fragment of Existential Second-Order Logic and Logics with Team Semantics

Authors Matthias Hoelzel, Richard Wilke



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Author Details

Matthias Hoelzel
  • Mathematical Foundations of Computer Science, RWTH Aachen University, Aachen, Germany
Richard Wilke
  • Mathematical Foundations of Computer Science, RWTH Aachen University, Aachen, Germany

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Matthias Hoelzel and Richard Wilke. On the Union Closed Fragment of Existential Second-Order Logic and Logics with Team Semantics. In 28th EACSL Annual Conference on Computer Science Logic (CSL 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 152, pp. 25:1-25:16, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)
https://doi.org/10.4230/LIPIcs.CSL.2020.25

Abstract

We present syntactic characterisations for the union closed fragments of existential second-order logic and of logics with team semantics. Since union closure is a semantical and undecidable property, the normal form we introduce enables the handling and provides a better understanding of this fragment. We also introduce inclusion-exclusion games that turn out to be precisely the corresponding model-checking games. These games are not only interesting in their own right, but they also are a key factor towards building a bridge between the semantic and syntactic fragments. On the level of logics with team semantics we additionally present restrictions of inclusion-exclusion logic to capture the union closed fragment. Moreover, we define a team based atom that when adding it to first-order logic also precisely captures the union closed fragment of existential second-order logic which answers an open question by Galliani and Hella.

Subject Classification

ACM Subject Classification
  • Theory of computation → Higher order logic
Keywords
  • Higher order logic
  • Existential second-order logic
  • Team semantics
  • Closure properties
  • Union closure
  • Model-checking games
  • Syntactic charactisations of semantical fragments

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References

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