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sounds like OR to me, none of the references I have encountered mention either Pierre de Fermat or adequality |
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In [[non-standard analysis]], the '''standard part function''' "st" is a mathematical implementation of [[Pierre de Fermat]]'s [[adequality]]{{fact}}. It is the key ingredient in [[Abraham Robinson]]'s formalisation of Leibniz's [[infinitesimal]] definition (see [[ghosts of departed quantities]]) of the derivative as the ratio of two infinitesimals
:<math>\frac{dy}{dx}</math>,
see more at [[non-standard calculus]].
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