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Ideas for 'Mahaprajnaparamitashastra', 'Reference and Essence (1st edn)' and 'Some Remarks on Essentialism'

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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

14627	S4, and therefore S5, are invalid for metaphysical modality [Salmon,N, by Williamson]
	Full Idea: Salmon argues that S4 and therefore S5 are invalid for metaphysical modality.
	From: report of Nathan Salmon (Reference and Essence (1st edn) [1981], 238-40) by Timothy Williamson - Modal Logic within Counterfactual Logic 4
	A reaction: [He gives references for Salmon, and for his own reply] Salmon's view seems to be opposed my most modern logicians (such as Ian Rumfitt).