Combining Texts

Ideas for 'Reference and Essence (1st edn)', 'On the Soul (frags)' and 'Mathematical logic and theory of types'

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2 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 / F. Set Theory ST / 8. Critique of Set Theory

11064

Classes can be reduced to propositional functions [Russell, by Hanna]