Combining Texts

Ideas for 'Wiener Logik', 'Reference and Essence (1st edn)' and 'The Barcan Formula and Metaphysics'

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4 ideas

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

14627

S4, and therefore S5, are invalid for metaphysical modality [Salmon,N, by Williamson]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

16187

The Barcan Formulas are orthodox, but clash with the attractive Actualist view [Simchen]

16186

The Barcan Formulas express how to combine modal operators with classical quantifiers [Simchen]

16190

BF implies that if W possibly had a child, then something is possibly W's child [Simchen]