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'Unconscious Cerebral Initiative', 'New Foundations for Mathematical Logic' and 'My Philosophical Development'
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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 / 8. Critique of Set Theory
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I gradually replaced classes with properties, and they ended as a symbolic convenience [Russell]
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