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Gödel justification logics and realization

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Abstract

We study the topic of realization from classical justification logics in the context of the recently introduced Gödel justification logics. We show that the standard Gödel modal logics of Caicedo and Rodriguez are not realized by the Gödel justification logics and moreover, we study possible extensions of the Gödel justification logics, which are strong enough to realize the standard Gödel modal logics. On the other hand, we study the fragments of the standard Gödel modal logics, which are realized by the usual Gödel justification logics. We prove the corresponding realization theorem by using Fitting's merging of realizations as well as appropriate hypersequent calculi on the modal side, adapting the work by Metcalfe and Olivetti. For these hypersequent calculi, we also show a cut-elimination theorem. We provide natural semantical characterizations for all of these newly introduced logics.

Original languageEnglish
Pages (from-to)343-408
Number of pages66
JournalLogic Journal of the IGPL
Volume30
Issue number3
Early online date8 Jan 2021
DOIs
Publication statusPublished - 21 May 2022

Keywords

  • fuzzy logic
  • Gödel logic
  • Justification logic
  • modal logic
  • realization

ASJC Scopus subject areas

  • Logic

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