Standard part function: Difference between revisions

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[[Image:Gottfried Wilhelm von Leibniz.jpg|thumb|200px|right|''[[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 offormalisation (the paradoxmore usual formalisation is via [[(ε, δ)-definition of limit]]) of Leibniz's informal definition (see [[Ghostsghosts of departed quantities]]) of the derivative as the ratio of two infinitesimals

:<math>\frac{dy}{dx}</math>,

see more at [[non-standard calculus]].