Combining Philosophers

Ideas for Jonathan Kvanvig, Richard Tuck and Timothy Williamson

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5 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
In S5 matters of possibility and necessity are non-contingent [Williamson]
If metaphysical possibility is not a contingent matter, then S5 seems to suit it best [Williamson]
4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
If the domain of propositional quantification is constant, the Barcan formulas hold [Williamson]
If a property is possible, there is something which can have it [Williamson]
Converse Barcan: could something fail to meet a condition, if everything meets that condition? [Williamson]