Synthetic Completeness for a Terminating Seligman-Style Tableau System

Author Asta Halkjær From

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Asta Halkjær From
  • Technical University of Denmark, Kongens Lyngby, Denmark


We thank Patrick Blackburn, Thomas Bolander, Torben Braüner, Klaus Frovin Jørgensen and Jørgen Villadsen for discussions and Lars Hupel, Jasmin Blanchette and the anonymous reviewers for comments on the paper.

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Asta Halkjær From. Synthetic Completeness for a Terminating Seligman-Style Tableau System. In 26th International Conference on Types for Proofs and Programs (TYPES 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 188, pp. 5:1-5:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)


Hybrid logic extends modal logic with nominals that name worlds. Seligman-style tableau systems for hybrid logic divide branches into blocks named by nominals to achieve a local proof style. We present a Seligman-style tableau system with a formalization in the proof assistant Isabelle/HOL. Our system refines an existing system to simplify formalization and we claim termination from this relationship. Existing completeness proofs that account for termination are either analytic or based on translation, but synthetic proofs have been shown to generalize to richer logics and languages. Our main result is the first synthetic completeness proof for a terminating hybrid logic tableau system. It is also the first formalized completeness proof for any hybrid logic proof system.

Subject Classification

ACM Subject Classification
  • Theory of computation → Modal and temporal logics
  • Hybrid logic
  • Seligman-style tableau
  • synthetic completeness
  • Isabelle/HOL


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