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'', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'Intro to 'Philosophical Essays''
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6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / b. Types of number
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Cardinals say how many, and reals give measurements compared to a unit quantity [Frege]
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6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / g. Real numbers
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Real numbers are ratios of quantities [Frege, by Dummett]
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