Tableaux for essence and contingency

Logic Journal of the IGPL 29 (5):719-738 (2021)
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Abstract

We offer tableaux systems for logics of essence and accident and logics of non-contingency, showing their soundness and completeness for Kripke semantics. We also show an interesting parallel between these logics based on the semantic insensitivity of the two non-normal operators by which these logics are expressed.

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Author Profiles

Pedro Teixeira Yago
Scuola Normale Superiore
Giorgio Venturi
University of Campinas

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References found in this work

An Introduction to Non-Classical Logic: From If to Is.Graham Priest - 2008 - New York: Cambridge University Press.
Modal Logic.Patrick Blackburn, Maarten de Rijke & Yde Venema - 2001 - Studia Logica 76 (1):142-148.
An Introduction to Non-Classical Logic: From If to Is.Graham Priest - 2008 - Bulletin of Symbolic Logic 14 (4):544-545.
First-Order Modal Logic.Melvin Fitting & Richard L. Mendelsohn - 1998 - Dordrecht, Netherland: Kluwer Academic Publishers.
The logic of essence.Kit Fine - 1995 - Journal of Philosophical Logic 24 (3):241 - 273.

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