modified Bessel function of the first kind
Complete monotonicity of a difference between the exponential and trigamma functions
The authors give a new proof of the almost obvious fact that the function \(f(t)= \exp(1/t)- \psi'(t)\) is completely monotonic on \((0,\infty)\). Here \(\psi'(t)\) denotes the derivative of Euler's trigamma function.
scientific article; zbMATH DE number 6335570