Weighted Hermite-Hadamard inequalities for <i>r</i>-times differentiable preinvex functions for <i>k</i>-fractional integrals

Abstract In this article, we have established some new bounds of Fejér-type Hermite-Hadamard inequality for k k -fractional integrals involving r r -times differentiable preinvex functions. It is noteworthy that in the past, there was no weighted version left and right sides generalized convex functions available literature.