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Ideas for 'New Scientist articles', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'works'

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

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A number is a class of classes of the same cardinality [Frege, by Dummett]

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Frege's biggest error is in not accounting for the senses of number terms [Hodes on Frege]