Abstract
This paper presents a bivalent extensional semantics for positive free logic without resorting to the philosophically questionable device of using models endowed with a separate domain of “non-existing” objects. The models here introduced have only one (possibly empty) domain, and a partial reference function for the singular terms (that might be undefined at some arguments). Such an approach provides a solution to an open problem put forward by Lambert, and can be viewed as supplying a version of parametrized truth non unlike the notion of “truth at world” found in modal logic. A model theory is developed, establishing compactness, interpolation (implying a strong form of Beth definability), and completeness (with respect to a particular axiomatization).
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Antonelli, G.A. Proto-Semantics for Positive Free Logic. Journal of Philosophical Logic 29, 277–294 (2000). https://doi.org/10.1023/A:1004748615483
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DOI: https://doi.org/10.1023/A:1004748615483