Abstract

We establish some inequalities of Simpson type involving Riemann-Liouville fractional integrals for mappings whose first derivatives are h-convex.

1. Introduction

The following inequality is well known in the literature as Simpson’s inequality.

Theorem 1. Let be four times continuously differentiable mapping on and .
Then, the following inequality holds:

In [1], Dragomir et al. proved the following inequality.

Theorem 2. Suppose is a differentiable mapping whose derivative is continuous on and . Then the following inequality holds:where .

In [2], Sarikaya et al. obtained inequalities for differentiable convex mappings. The main inequality is as follows.

Theorem 3. Let be a differentiable mapping on such that , where with . If is convex on , , then the following inequality holds:where .

In [3], Sarikaya et al. obtained the following inequality for -convex function.

Theorem 4. Let be a differentiable mapping on such that , where with . If is -convex on , for some fixed and , then the following inequality holds:where .

For recent refinements, counterparts, generalizations, and inequalities of Simpson type, see [1–7].

In 2007, Varošanec in [8] introduced a large class of functions, the so-called -convex functions. This class contains several well-known classes of functions such as nonnegative convex functions and -convex functions. This class is defined in the following way: a function , being an interval, is called -convex ifholds for all , , where , , and is an interval, .

The aim of this paper is to establish inequalities of Simpson type for -convex mappings via fractional integrals which are defined in the following way: left-sided and right-sided Riemann-Liouville fractional integrals of the order are defined bywhere is the gamma function. Here is .

2. Main Results

To prove our main results, we consider the following lemma.

Lemma 5. Let be an absolutely continuous mapping on such that , where with . Then the following inequality holds:

Proof. By integration by parts and by the change of the variables, we haveSimilarly, we have From (8) and (9), we get (7). This completes the proof.

The following theorems give a new result of Simpson’s inequality for -convex functions via fractional integrals.

Theorem 6. Let be a differentiable mapping on such that , where with . If is -convex on , then the following inequality holds:

Proof. From Lemma 5 and since is -convex on , we getwhere we used the fact that for all .
The proof is completed.

Corollary 7. If in Theorem 6 one takes then inequality (10) reduces to the following inequality for the convex function:

Corollary 8. If in Theorem 6 one takes then inequality (10) reduces to the following inequality for the -convex function:

Corollary 9. If in Theorem 6 one takes and then from the proof of Theorem 6 it follows that the following inequality holds:

Theorem 10. Let be a differentiable mapping on such that , where with . If is -convex on and , then the following inequality holds:

Proof. From Lemma 5 and the Hőlder inequality, we havewhere .
Because is -convex, we haveUsing the fact that for all and using the last two inequalities in (16) we obtain (15).
This completes the proof of the theorem.

Corollary 11. If in Theorem 10 one takes then inequality (15) reduces to the following inequality for the convex function:

Corollary 12. If in Theorem 10 one takes then inequality (15) reduces to the following inequality for the -convex function:

Theorem 13. Let be a differentiable mapping on such that , where with . If is -convex on and , then the following inequality holds: