Combining Texts
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'Parmenides', 'On 'Insolubilia' and their solution' and 'New Foundations for Mathematical Logic'
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
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NF has no models, but just blocks the comprehension axiom, to avoid contradictions [Quine, by Dummett]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / c. Logical sets
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The 'no classes' theory says the propositions just refer to the members [Russell]
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