Logarithmic derivative
In mathematics, specifically in calculus and complex analysis, the logarithmic derivative of a function f is defined by the formula
where ![f'](/Images/godic/202501/24/6bda8af54c40bc23ed858e9e9f5c11d23229.png")
is the derivative of f. Intuitively, this is the infinitesimal relative change in f; that is, the infinitesimal absolute change in f, namely ![f',](/Images/godic/202501/24/9cef8b1a8c69f71e2ac568b12347c9693229.png")
scaled by the current value of f.