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[[Image:Gottfried Wilhelm von Leibniz.jpg|thumb|200px|left|''[[Gottfried Wilhelm Leibniz]]'' Inventor of infinitesimal calculus]]
In [[non-standard analysis]], the '''standard part function''' "st" is the key ingredient in [[Abraham Robinson]]'s resolution of the paradox of Leibniz's definition of the derivative as the ratio of two infinitesimals <math>\tfrac{dy}{dx}</math>, see more at [[non-standard calculus]].
==Definition==
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