Ideas from 'Cours d'Analyse' by Augustin-Louis Cauchy [1821], by Theme Structure

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6. Mathematics / A. Nature of Mathematics / 4. The Infinite / l. Infinitesimals
Values that approach zero, becoming less than any quantity, are 'infinitesimals'
6. Mathematics / A. Nature of Mathematics / 4. The Infinite / m. Limits
When successive variable values approach a fixed value, that is its 'limit'