Generalization of Hermite-Hadamard type inequalities for n-times differentiable functions which are s-preinvex in the second sense with applications

In this paper, Hermite-Hadamard inequality for differentiable preinvex functions is generalized and refined for n -times differentiable functions which are s -preinvex in the second sense. Some recent results are also improved and applications to special means of positive numbers are given.