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'Parmenides', 'Logic for Philosophy' and '68: Generation of the soul in 'Timaeus''
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / e. Peano arithmetic 2nd-order
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A single second-order sentence validates all of arithmetic - but this can't be proved axiomatically [Sider]
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6. Mathematics / C. Sources of Mathematics / 1. Mathematical Platonism / a. For mathematical platonism
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One is, so numbers exist, so endless numbers exist, and each one must partake of being [Plato]
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