%0 Journal Article %T On the logarithm of the derivative operator %A D. Babusci %A G. Dattoli %J Mathematics %D 2011 %I arXiv %X We study the properties of the logarithm of the derivative operator and show that its action on a constant is not zero, but yields the sum of the logarithmic function and the Euler-Mascheroni constant. We discuss more general aspects concerning the logarithm of an operator for the study of the properties of the Bessel functions. %U http://arxiv.org/abs/1105.5978v2