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A Sequent Calculus for a Modal Logic on Finite Data Trees

Authors David Baelde, Simon Lunel, Sylvain Schmitz

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David Baelde
Simon Lunel
Sylvain Schmitz

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David Baelde, Simon Lunel, and Sylvain Schmitz. A Sequent Calculus for a Modal Logic on Finite Data Trees. In 25th EACSL Annual Conference on Computer Science Logic (CSL 2016). Leibniz International Proceedings in Informatics (LIPIcs), Volume 62, pp. 32:1-32:16, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2016)


We investigate the proof theory of a modal fragment of XPath equipped with data (in)equality tests over finite data trees, i.e., over finite unranked trees where nodes are labelled with both a symbol from a finite alphabet and a single data value from an infinite domain. We present a sound and complete sequent calculus for this logic, which yields the optimal PSPACE complexity bound for its validity problem.
  • XPath
  • proof systems
  • modal logic
  • complexity


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