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Ideas for 'On What Grounds What', 'Metaphysics of Morals I: Doctrine of Right' and 'Letter Seven'

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6. Mathematics / C. Sources of Mathematics / 1. Mathematical Platonism / a. For mathematical platonism

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If 'there are red roses' implies 'there are roses', then 'there are prime numbers' implies 'there are numbers' [Schaffer,J]