Single Idea 14627

[catalogued under 4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5]

Full Idea

Salmon argues that S4 and therefore S5 are invalid for metaphysical modality.

Gist of Idea

S4, and therefore S5, are invalid for metaphysical modality

Source

report of Nathan Salmon (Reference and Essence (1st edn) [1981], 238-40) by Timothy Williamson - Modal Logic within Counterfactual Logic 4

Book Reference

'Modality', ed/tr. Hale,B/Hoffman,A [OUP 2010], p.92

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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).