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6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / b. Quantity

[specifiying amounts of things numerically]

4 ideas
Some quantities can't be measured, and some non-quantities are measurable [Russell]
Quantity is not part of mathematics, where it is replaced by order [Russell]
Real numbers were invented, as objects, to simplify and generalise 'quantity' [Mayberry]
Greek quantities were concrete, and ratio and proportion were their science [Mayberry]