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'fragments/reports', 'Realism in Mathematics' and 'Reference and Essence (1st edn)'
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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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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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Maddy replaces pure sets with just objects and perceived sets of objects [Maddy, by Shapiro]
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