Combining Philosophers

Ideas for Hermarchus, Ian Rumfitt and Joseph Melia

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3 ideas

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

12204

The logic of metaphysical necessity is S5 [Rumfitt]

18814

'Absolute necessity' would have to rest on S5 [Rumfitt]