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'General Facts,Phys Necessity, and Metaph of Time', 'Reference and Essence (1st edn)' and 'Frege's Distinction of Sense and Reference'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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S4, and therefore S5, are invalid for metaphysical modality [Salmon,N, by Williamson]
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