logarithmic derivative

(redirected from Log-derivative)

logarithmic derivative

[′läg·ə‚rith·mik də′riv·əd·iv]
(mathematics)
The logarithmic derivative of a function ƒ(z) of a real (complex) variable is the ratio ƒ′(z)/ƒ(z), that is, the derivative of log ƒ(z).