Notre Dame Journal of Formal Logic 58 (2):221-239 (2017)

Authors
Thomas Ferguson
City University of New York
Abstract
J. Michael Dunn’s Theorem in 3-Valued Model Theory and Graham Priest’s Collapsing Lemma provide the means of constructing first-order, three-valued structures from classical models while preserving some control over the theories of the ensuing models. The present article introduces a general construction that we call a Dunn–Priest quotient, providing a more general means of constructing models for arbitrary many-valued, first-order logical systems from models of any second system. This technique not only counts Dunn’s and Priest’s techniques as special cases, but also provides a generalized Collapsing Lemma for Priest’s more recent plurivalent semantics in general. We examine when and how much control may be exerted over the resulting theories in particular cases. Finally, we expand the utility of the construction by showing that taking Dunn–Priest quotients of a family of structures commutes with taking an ultraproduct of that family, increasing the versatility of the tool.
Keywords Dunn–Priest techniques   model theory  many-valued logic
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DOI 10.1215/00294527-3838853
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References found in this work BETA

The Logic of Paradox.Graham Priest - 1979 - Journal of Philosophical Logic 8 (1):219 - 241.
Minimally Inconsistent LP.Graham Priest - 1991 - Studia Logica 50 (2):321 - 331.
Plurivalent Logics.Graham Priest - 2014 - Australasian Journal of Logic 11 (1).

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