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logarithmic differentiation

   Also found in: Wikipedia 0.02 sec.
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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