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Ideas for 'Structures and Structuralism in Phil of Maths', 'works' and 'Reference and Essence (1st edn)'

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2 ideas

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]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets

10166

ZFC set theory has only 'pure' sets, without 'urelements' [Reck/Price]