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Ideas for 'works', 'Replies to Critics' and 'On Concept and Object'

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6. Mathematics / B. Foundations for Mathematics / 3. Axioms for Geometry

13007

Archimedes defined a straight line as the shortest distance between two points [Archimedes, by Leibniz]

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

9949	There is the concept, the object falling under it, and the extension (a set, which is also an object) [Frege, by George/Velleman]