“…The fractional differential equations ( [1], [15], [16], [17], [36], [39]) are a particularly important case of such fundamental tools. An important type of fractional differential equations is that of fractional functional differential equations (FFDE) ( [9], [13], [25], [42]) which are the fractional analogue to functional differential equations ( [3], [19], [21], [32]). FFDE enable the study of some physical, biological, social, economical processes (automatic control, financial dynamics, economical planning, population dynamics, blood cell dynamics, infectious disease dynamics.…”