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  1. Tree-Like Proof Systems for Finitely-Many Valued Non-Deterministic Consequence Relations.Pawel Pawlowski - 2020 - Logica Universalis 14 (4):407-420.
    The main goal of this paper is to provide an abstract framework for constructing proof systems for various many-valued logics. Using the framework it is possible to generate strongly complete proof systems with respect to any finitely valued deterministic and non-deterministic logic. I provide a couple of examples of proof systems for well-known many-valued logics and prove the completeness of proof systems generated by the framework.
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  • Modal Logic with Non-Deterministic Semantics: Part I—Propositional Case.Marcelo E. Coniglio, Fariñas Del Cerro Luis & Marques Peron Newton - 2020 - Logic Journal of the IGPL 28 (3):281-315.
    Dugundji proved in 1940 that most parts of standard modal systems cannot be characterized by a single finite deterministic matrix. In the eighties, Ivlev proposed a semantics of four-valued non-deterministic matrices, in order to characterize a hierarchy of weak modal logics without the necessitation rule. In a previous paper, we extended some systems of Ivlev’s hierarchy, also proposing weaker six-valued systems in which the axiom was replaced by the deontic axiom. In this paper, we propose even weaker systems, by eliminating (...)
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  • Finite Non-Deterministic Semantics for Some Modal Systems.Marcelo E. Coniglio, Luis Fariñas del Cerro & Newton M. Peron - 2015 - Journal of Applied Non-Classical Logics 25 (1):20-45.
    Trying to overcome Dugundji’s result on uncharacterisability of modal logics by finite logical matrices, Kearns and Ivlev proposed, independently, a characterisation of some modal systems by means of four-valued multivalued truth-functions , as an alternative to Kripke semantics. This constitutes an antecedent of the non-deterministic matrices introduced by Avron and Lev . In this paper we propose a reconstruction of Kearns’s and Ivlev’s results in a uniform way, obtaining an extension to another modal systems. The first part of the paper (...)
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