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For questions about infinitesimals, both in an intuitive sense as well as more rigorous settings (see also [nonstandard-analysis]).

Intuitively, an infinitesimal is an infinitely small number. They played a significant role in both Leibniz's and Newton developments of calculus, as well as in the work of Archimedes.

For a more rigorous treatment of infinitesimals, also see .

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