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

Hausmann, Marco (2021): The Uniqueness of Necessary Truth and the Status of S4 and S5. In: Theoria-A Swedish Journal of Philosophy, Vol. 87, No. 6: pp. 1635-1650

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.

• Item Type: Journal article
• Faculties: Philosophy, Philosophy of Science and Religious Science
• Subjects: 100 Philosophy and Psychology > 100 Philosophy
• ISSN: 0040-5825
• Language: English