Abstract
In [Woodruff 1984] I showed that the supervaluation semantics introduced by [Van Fraassen 1966a, b] for Lambert’s system of free logic [Meyer and Lambert 1968] failed to have certain metatheoretic properties (compactness, upward and downward Löwenheim-Skolem, strong completeness and recursive axiomatizability) which attach to ordinary first-order logic. I also introduced the idea of secondary supervaluations, in which the class of conventions for asigning truth values to formulas with non-designating terms was restricted in some way or another. I was able to show that for a particular such restriction, the falsity condition (R(cx) false of all x when c doesn’t denote), the desirable properties were regained. I speculated that the indifference condition (R(cx) true either of all or of no xwhen cdoesn’t denote) would also suffice, and might be necessary.1
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References
Bencivenga, Ermanno: 1983, ‘Compactness of a supervaluational language’, Journal of Symbolic Logic 48, 384–386.
Dwyer, Robert: 1989, Denoting and Defining, PhD Dissertation, University of California, Irvine.
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© 1991 Kluwer Academic Publishers
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Woodruff, P.W. (1991). Actualism, Free Logic and First-Order Supervaluations. In: Spohn, W., Van Fraassen, B.C., Skyrms, B. (eds) Existence and Explanation. The University of Western Ontario Series in Philosophy of Science, vol 49. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3244-2_15
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DOI: https://doi.org/10.1007/978-94-011-3244-2_15
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