“…There are several definitions of fractional derivatives such as Hadamard derivative, Grunwald Letnikov derivative, Riemann Liouville fractional derivative, Caputo fractional derivative etc. For the basics of fractional calculus, one can refer to the monographs [10,15,21,22] and for recent developments in this field, we can make references to the papers [2,6,11,20,32] and references cited therein.…”