Combining Texts
Ideas for
'Three Varieties of Knowledge', 'Barcan Formulae' and 'The Nature of Things'
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2 ideas
4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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Barcan:nothing comes into existence; Converse:nothing goes out; Both:domain is unchanging [Vervloesem]
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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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A class is natural when everybody can spot further members of it [Quinton]
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