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'Structures and Structuralism in Phil of Maths', 'Scientific Objectivity' 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 / 4. Axioms for Sets / a. Axioms for sets
10166
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ZFC set theory has only 'pure' sets, without 'urelements' [Reck/Price]
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