Combining Philosophers

Ideas for Weisberg/Needham/Hendry, Plato and Timothy Williamson

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5 ideas

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

14626

In S5 matters of possibility and necessity are non-contingent [Williamson]

15131

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

15135

If the domain of propositional quantification is constant, the Barcan formulas hold [Williamson]

15130

If a property is possible, there is something which can have it [Williamson]

15139

Converse Barcan: could something fail to meet a condition, if everything meets that condition? [Williamson]