Combining Texts
Ideas for
'Mahaprajnaparamitashastra', 'Ontology and Mathematical Truth' and 'Intro: Theories of Vagueness'
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2 ideas
4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
9065
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S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P) [Keefe/Smith]
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
9967
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'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]
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