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'Cours d'Analyse', 'works' and 'Philosophy of Arithmetic'
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5 ideas
6. Mathematics / A. Nature of Mathematics / 3. Nature of Numbers / l. Zero
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9837
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0 is not a number, as it answers 'how many?' negatively [Husserl, by Dummett]
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6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / a. Units
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9576
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Multiplicity in general is just one and one and one, etc. [Husserl]
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6. Mathematics / A. Nature of Mathematics / 4. Using Numbers / e. Counting by correlation
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17444
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Husserl said counting is more basic than Frege's one-one correspondence [Husserl, by Heck]
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6. Mathematics / A. Nature of Mathematics / 5. The Infinite / k. Infinitesimals
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18085
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Values that approach zero, becoming less than any quantity, are 'infinitesimals' [Cauchy]
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6. Mathematics / A. Nature of Mathematics / 5. The Infinite / l. Limits
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18084
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When successive variable values approach a fixed value, that is its 'limit' [Cauchy]
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