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
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S4, and therefore S5, are invalid for metaphysical modality [Salmon,N, by Williamson]
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4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory
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Classes can be reduced to propositional functions [Russell, by Hanna]
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