logarithmic derivative

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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).
References in periodicals archive ?
The condition for optimal CAS speed is obtained by logarithmic differential method, which is numerically solved by Newton- Ramphson method.
For each segment of climbing, it is possible to define it by the method of logarithmic differential, optimal [CAS.sub.b] speed for minimum climb costs.
The technique used to find the condition of optimal [CAS.sub.b] for each b-th climb segment is logarithmic differential. Let's define logarithmic differential of [RDOC.sub.b] on b-th climb segment.