Combining Texts
Ideas for
'Parmenides', 'Ontology and Mathematical Truth' and 'Logical Necessity'
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2 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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The logic of metaphysical necessity is S5 [Rumfitt]
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
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'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]
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