“…It is used for studying simple dynamical systems, but it also describes complex physical systems. For example, applications of the fractional calculus can be found in chaotic dynamics, control theory, stochastic modeling, but also in finance, hydrology, biophysics, physics, astrophysics, cosmology and so on ( [5], [6], [8], [9], [10]). But some other fields have just started to study problems from fractional point of view.…”