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Ideas for 'Modality', 'Two treatises' and 'Scientific Essentialism'

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4. Formal Logic / D. Modal Logic ML / 1. Modal Logic

5744	First-order predicate calculus is extensional logic, but quantified modal logic is intensional (hence dubious) [Melia]

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

13604

Real possibility and necessity has the logic of S5, which links equivalence classes of worlds of the same kind [Ellis]