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'The Evolution of Modern Metaphysics', 'Iteration Again' and 'Mere Possibilities'
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / b. Axiom of Extensionality I
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In modal set theory, sets only exist in a possible world if that world contains all of its members [Stalnaker]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / f. Limitation of Size
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Limitation of Size is weak (Fs only collect is something the same size does) or strong (fewer Fs than objects) [Boolos, by Potter]
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