: Mathématiques: logarithmic derivative

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... > elementary algebra > operation > algebraic operation > logarithm > logarithmic derivative

mathematical analysis > calculus > differential calculus > logarithmic derivative

logarithmic derivative

In mathematics, specifically in calculus and complex analysis, the logarithmic derivative of a function f is defined by the formula
${\\displaystyle {\ rac {f'}{f}}}$ where ${\\displaystyle f'}$ is the derivative of f. Intuitively, this is the infinitesimal relative change in f; that is, the infinitesimal absolute change in f, namely ${\\displaystyle f',}$ scaled by the current value of f.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Logarithmic_derivative)

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