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'Letter to Bramhall', 'On Second-Order Logic' and 'Foundations of Geometry'
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6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Geometry
10052
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Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave]
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6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / e. Peano arithmetic 2nd-order
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Many concepts can only be expressed by second-order logic [Boolos]
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