“…This topic has attracted much attention from researchers who focus on the study of partial differential equations during the last few decades. For recent results related to this subject, we refer to some studies by Sohail et al [14], Hameed et al [15], and Khan et al [16,17]. Among a lot of the fractional integral operators growed, the Riemann-Liouville fractional integral operator has been extensively studied, because of applications in many fields of sciences, such as differential equations, differential geometry and physics science.…”