The Uniqueness of Necessary Truth and the Status of S4 and S5

Theoria 87 (6):1635-1650 (2021)
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Abstract

The aim of this paper is to relate the debate about the status of S4 and S5 as modal logics for metaphysical modality to the debate about the identity of propositions. The necessary truth of the characteristic axioms of S4 and S5 (when interpreted in terms of metaphysical modality) is derived from a view about the identity of propositions, the view that necessarily equivalent propositions are identical.

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10.1111/theo.12371

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References found in this work

The Nature of Necessity.Alvin Plantinga - 1974 - Oxford, England: Clarendon Press.
Situations and attitudes.Jon Barwise & John Perry - 1981 - Journal of Philosophy 78 (11):668-691.
Naming and Necessity.Saul Kripke - 1980 - Philosophy 56 (217):431-433.
Essence and modality.Kit Fine - 1994 - Philosophical Perspectives 8 (Logic and Language):1-16.
On the Plurality of Worlds.David Lewis - 1986 - Revue Philosophique de la France Et de l'Etranger 178 (3):388-390.

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