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'works', 'Review of Frege's 'Grundlagen'' and 'On the Principles of Indiscernibles'
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6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Geometry
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Archimedes defined a straight line as the shortest distance between two points [Archimedes, by Leibniz]
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6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / c. Fregean numbers
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The 'extension of a concept' in general may be quantitatively completely indeterminate [Cantor]
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