“…In recent years, fractional calculus and derivative have encountered much success in many fields of science, for instance, mechanical engineering [1][2][3][4][5][6], viscoelasticity [7], Le´vy motion [8], electron transportation [9], dissipation [10], heat conduction [11][12][13], high-frequency financial data [14] and image processing [15][16][17][18]. Hence, in past decades, the study of fractional diffusion equations has attracted intense attention.…”