Applying GG-Convex Function to Hermite-Hadamard Inequalities Involving Hadamard Fractional Integrals

By virtue of fractional integral identities, incomplete beta function, useful series, and inequalities, we apply the concept of GG-convex function to derive new type Hermite-Hadamard inequalities involving Hadamard fractional integrals. Finally, some applications to special means of real numbers are demonstrated. 1. Introduction Fractional calculus played an important role in various fields such as electricity, biology, economics, and signal and image processing [1–8]. The fractional Hermite-Hadamard inequality gives a lower and an upper estimation for both right-hand and left-hand integrals average of any convex function defined on a compact interval, involving the midpoint and the endpoints of the domain. As we know, Set [9] firstly studied fractional Ostrowski inequalities involving Riemann-Liouville fractional integrals. Then, Sarikaya et al. [10] studied Hermite-Hadamard type inequalities involving Riemann-Liouville fractional integrals. Further, our group go on studying fractional version Hermite-Hadamard inequality involving Riemann-Liouville and Hadamard fractional integrals for all kinds of functions [11–19]. Recently, Wang et al. [16, 17] established the following two powerful fractional integral identities involving Hadamard fractional integrals. Lemma 1 (see [12, Lemma 3.1]). Let be a differentiable mapping on . If , then the following equality for fractional integrals holds: where the symbols and are defined by where is the Gamma function. Lemma 2 (see [11, Lemma 2.1]). Let be a differentiable mapping on with . If , then the following equality for fractional integrals holds: where Remark 3. It is remarkable that Professor Srivastava et al. [20] give some further refinements and extensions of the Hermite-Hadamard inequalities in variables. In the forthcoming works, we will try to extend to study fractional version Hermite-Hadamard inequalities in variables based on such fundamental results. Next, we recall the following basic concepts and results in our previous papers. Definition 4 (see [21, 22]). Let . A function is said to be GG-convex on if, for every and , one has Remark 5. By the arithmetic-geometric mean inequality, we have Linking (5) and (6), we obtain which appears in the standard definition of GA-convex function [21]. So GG-convex function is GA-convex function. Lemma 6 (see [19, Lemma 2.5]). For , one has Lemma 7 (see [13, Lemma 2.1]). For and , one has where . Lemma 8 (see [13, Lemma 2.2]). For and , one has Lemma 9 (see [13, Lemma 2.3]). For and , one has In the present paper, we will use the above concepts and lemmas to derive