Modal Logic With Non-deterministic Semantics: Part I - Propositional Case

Modal Logic With Non-deterministic Semantics: Part I - Propositional Case

In 1988, Ivlev proposed four-valued non-deterministic semantics for modal logics in which the alethic T axiom holds good. Unfortunately, no completeness was proved. In previous work, we proved completeness for some Ivlev systems and extended his hierarchy, proposing weaker six-valued systems in whic...

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Veröffentlicht in:arXiv.org 2018-08
Hauptverfasser: Coniglio, Marcelo E, Luis Fariñas del Cerro, Peron, Newton M
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Axioms
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Luis Fariñas del Cerro
Peron, Newton M
description In 1988, Ivlev proposed four-valued non-deterministic semantics for modal logics in which the alethic T axiom holds good. Unfortunately, no completeness was proved. In previous work, we proved completeness for some Ivlev systems and extended his hierarchy, proposing weaker six-valued systems in which the T axiom was replaced by the deontic D axiom. Here, we eliminate both axioms, proposing even weaker systems with eight values. Besides, we prove completeness for those new systems. It is natural to ask if a characterization by finite ordinary (deterministic) logical matrices would be possible for all those systems. We will show that finite deterministic matrices do not characterize any of them.
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title Modal Logic With Non-deterministic Semantics: Part I - Propositional Case
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