Abstract
Frame semantics, given by Kripke or neighborhood frames, do not give completeness theorems for all modal logics extending, respectively, K and E. Such shortcoming can be overcome by means of general frames, i.e., frames equipped with a collection of admissible sets of worlds (which is the range of possible valuations over such frame). We export this approach from the classical paradigm to modal many-valued logics by defining general \({\varvec{A}}\)-frames over a given residuated lattice \({\varvec{A}}\) (i.e., the usual frames with a collection of admissible \({\varvec{A}}\)-valued sets). We describe in detail the relation between general Kripke and neighborhood \({\varvec{A}}\)-frames and prove that, if the logic of \({\varvec{A}}\) is finitary, all extensions of the corresponding logic E of \({\varvec{A}}\) are complete w.r.t. general neighborhood frames. Our work provides a new approach to the current research trend of generalizing relational semantics for non-classical modal logics to circumvent axiomatization problems.
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It should be mentioned that there is another tradition in the study of modal extensions of non-classical logics which already have a certain ‘classical’ frame semantics (classical in the sense that both accessibility relations and valuation functions are two-valued), typical examples being the intuitionistic, relevant and other substructural logics. In this approach, modalities are modeled using additional classical accessibility relations/neighborhood functions (see e.g., Bierman and Paiva 2000; Fuhrmann 1990; Routley and Meyer 1972) or the corresponding chapter of Restall (2000)). Even though there are certain relations between both approaches stemming from algebra/frame dualities, the results of this stream of research are not directly relevant to the framework presented here.
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The authors are supported by the bilateral travel Project CONICET-CAS 16-04 ‘First-order many-valued logics.’ Cintula and Noguera were also supported by the Grant GA17-04630S of the Czech Science Foundation. Cintula also acknowledges the support of RVO 67985807 and Menchón of CONICET under Grant PIP 112-201501-00412
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The authors declare they have no conflict of interest. This article does not contain any studies with human participants or animals performed by any of the authors
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Communicated by Luca Spada.
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This paper is dedicated to Lluís Godo in the occasion of his 60th birthday.
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Cintula, P., Menchón, P. & Noguera, C. Toward a general frame semantics for modal many-valued logics. Soft Comput 23, 2233–2241 (2019). https://doi.org/10.1007/s00500-018-3369-5
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DOI: https://doi.org/10.1007/s00500-018-3369-5