Combining Texts
Ideas for
'The Nature of Things', 'Particle Physics' and 'Introduction to Russell's Theory of Types'
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / p. Axiom of Reducibility
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The Axiom of Reducibility is self-effacing: if true, it isn't needed [Quine]
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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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A class is natural when everybody can spot further members of it [Quinton]
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