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Ideas for 'Parmenides', 'On Concept and Object' and 'The Life of Reason'

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6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / c. Fregean numbers

9949	There is the concept, the object falling under it, and the extension (a set, which is also an object) [Frege, by George/Velleman]

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

16150

One is, so numbers exist, so endless numbers exist, and each one must partake of being [Plato]