# logarithmic differentiation

## logarithmic differentiation

[′läg·ə‚ri__th__·mik ‚dif·ə‚ren·chē′ā·shən]

(mathematics)

A technique often helpful in computing the derivatives of a differentiable function ƒ(

*x*); set*g*(*x*) = log ƒ(*x*) where ƒ(*x*) ≠ 0, then*g*′(*x*) = ƒ′(*x*)/ ƒ(*x*), and if there is some other way to find*g*′(*x*), then one also finds ƒ′(*x*).McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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