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Ideas for 'Necessary Existents', 'Review of Frege's 'Grundlagen'' and 'Knowledge and the Philosophy of Number'

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

9992	The 'extension of a concept' in general may be quantitatively completely indeterminate [Cantor]

6. Mathematics / B. Foundations for Mathematics / 6. Mathematics as Set Theory / b. Mathematics is not set theory

23621

Numbers are properties, not sets (because numbers are magnitudes) [Hossack]