logarithmic differentiation

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logarithmic differentiation [′läg·ə‚rith·mik ‚dif·ə‚ren·chē′ā·shən]

(mathematics)

A technique often helpful in computing the derivatives of a differentiable function ƒ(x); setg(x) = log ƒ(x) where ƒ(x) ≠ 0, theng′(x) = ƒ′(x)/ ƒ(x), and if there is some other way to findg′(x), then one also finds ƒ′(x).

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