“…One encounters them in the theory of systems with chaotic dynamics [35,42]; pseudochaotic dynamics [44]; dynamics in a complex or porous medium [10,30,37]; random walks with a memory and flights [28,36,43]; obstacle problems [6,34] and many other situations. Recently, fractional partial differential equation versions of some of the classical equations of mathematical physics have been studied, including the fractional Schrödinger equation [9,12,13,16,[18][19][20]29], the fractional Landau-Lifshitz equation [17], the fractional Landau-Lifshitz-Maxwell equation [31] and the fractional GinzburgLandau equation [25,27,39]. Furthermore, many recent studies of fractional derivative problems arise from probabilistic or purely mathematical considerations (see [1][2][3]5,11], for instance).…”