“…In recent years, there has been significant progress in both ordinary and partial fractional differential equations. For more details on the applications of fractional calculus, the reader is directed to the books of Abbas et al [1][2][3], Herrmann [4], Hilfer [5], Kilbas et al [6], Samko et al [7], and Zhou [8] and papers [9][10][11][12][13][14][15]. In [16,17], Benchohra et al demonstrated the existence, uniqueness, and stability results for various classes of problems with different conditions and some form of extension of the well-known Hilfer fractional derivative, which unifies the Riemann-Liouville and Caputo fractional derivatives.…”