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'fragments/reports', 'Defending the Axioms' and 'Nature's Metaphysics'
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
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The plausible Barcan formula implies modality in the actual world [Bird]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / j. Axiom of Choice IX
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The Axiom of Choice paradoxically allows decomposing a sphere into two identical spheres [Maddy]
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