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'Realism in Mathematics', 'On the Necessity of Origin' and 'On Second-Order Logic'
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / e. Peano arithmetic 2nd-order
10833
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Many concepts can only be expressed by second-order logic [Boolos]
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6. Mathematics / B. Foundations for Mathematics / 6. Mathematics as Set Theory / a. Mathematics is set theory
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A natural number is a property of sets [Maddy, by Oliver]
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