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'Philosophy of Mathematics', 'A World of Dispositions' and 'Grundgesetze der Arithmetik 1 (Basic Laws)'
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5 ideas
6. Mathematics / B. Foundations for Mathematics / 1. Foundations for Mathematics
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We can't prove everything, but we can spell out the unproved, so that foundations are clear [Frege]
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6. Mathematics / B. Foundations for Mathematics / 2. Proof in Mathematics
10885
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Computer proofs don't provide explanations [Horsten]
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6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / c. Fregean numbers
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Frege defined number in terms of extensions of concepts, but needed Basic Law V to explain extensions [Frege, by Hale/Wright]
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Frege ignored Cantor's warning that a cardinal set is not just a concept-extension [Tait on Frege]
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6. Mathematics / B. Foundations for Mathematics / 6. Mathematics as Set Theory / a. Mathematics is set theory
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The concept of 'ordinal number' is set-theoretic, not arithmetical [Horsten]
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