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3 ideas

6. Mathematics / A. Nature of Mathematics / 2. Geometry

9867	It is absurd to define a circle, but not be able to recognise a real one [Plato]

6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / f. Arithmetic

9865	Daily arithmetic counts unequal things, but pure arithmetic equalises them [Plato]

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]