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Research Article

Open Access Peer-reviewed

Serap Özcan^{ }

Received October 09, 2019; Revised November 11, 2019; Accepted November 20, 2019

In this paper, with a new approach, some new Hermite-Hadamard type inequalities for preinvex functions are obtained by using only the right Riemann-Liouville fractional integrals. Our results generalize previous studies. Results proved in this paper may stimulate further research in this field.

Let be a finite interval of real numbers. A function is said to be convex if the inequality

holds for and (see ^{ 1}).

Convexity plays a fundamental role in many branches of pure and applied sciences. In recent years, the investigation on extended convex functions has become a deep research area. The applications of extended convex functions in establishing various inequalities have received renewed attention by many researchers. A significant generalization of convex functions is that of invex functions introduced by Hanson ^{ 2}. Ben-Israel and Mond ^{ 3} introduced the notions of invex sets and preinvex functions. Pini ^{ 4} introduced the notion of prequasiinvex functions which is a generalization of invex functions. Weir and Mond ^{ 5} and Noor ^{ 6} have studied the basic properties of the preinvex functions. For recent applications and generalizations of the preinvex functions, see ^{ 7, 8, 9, 10, 11, 12, 13, 14} and references therein.

Inequalities have a key role in pure and applied mathematics. A number of studies have shown that the theory of convexity has a closely relationship with the theory of inequalities. One of the most famous inequality in the literature for convex functions is known as Hermite-Hadamard integral inequality. This double inequality is stated as:

Let be a convex function on Then the following inequality holds:

Hermite-Hadamard inequality for convex functions has attracted many researchers and as gradually a remarkable of generalizations and extensions in various directions have appeared in the literature, one can see ^{ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24} and references therein.

Let us recall some definitions and known results concerning invexity and preinvexity.

**Definition 1****.**** **^{ 25}* *A set* ** *is said to be invex if there exist a function such that

The invex set is also called a -connected set.

**Definition 2****.**** **^{ 5}* *Let* * be a function on the invex set Then,* *is said to be preinvex with respect to * *if

It is to be noted that every convex function is preinvex with respect to the map but the converse is not true in general.

In ^{ 26} Noor obtained the following Hermite-Hadamard inequalities for the preinvex functions.

**Theorem 1****.**** **Let* ** *be a preinvex function on the interval of real numbers* ** *and* ** *with* ** *Then the following inequality holds:

Following definitions of the left and right side Riemann-Liouville fractional integrals are well known in the literature.

**Definition 3****.**** **^{ 27}** **Let* ** *The left and right Riemann-Liouville fractional integrals* ** *and* ** **of *order* ** *are defined by* *

and

respectively, where is the Gamma function defined by

In ^{ 22}, Sarıkaya et al. gave the fractional analogue of the inequality (1) as follows:

** ****Theorem 2****.**** **Let be a positive function with and If is a convex function on then the following inequalities for fractional integrals hold:

with

In ^{ 28}, Iscan proved the following Hermite-Hadamard inequalities for preinvex functions via Riemann-Liouville fractional integrals:

**Theorem 3****.**** **Let be an open invex subset with respect to and with If is a preinvex function, then the following inequalities for fractional integrals hold:

with

In this section, we will obtain some generalizations of the right side of the Hermite- Hadamard type inequalities for functions whose first derivatives absolute values are preinvex via right Riemann-Liouville fractional integrals.

**Lemma 1****.**** **Let* ** *be an open invex subset with respect to* ** *and* ** *with* ** *Suppose* ** *is a differentiable mapping on* *such that* ** *Then the following equality for the right Riemann-Liouville fractional integrals holds:

Proof. If we apply the partial integration to the right hand side of the above equality, we have

This completes the proof.

**Remark 1****.**** **In Lemma 1,* *

1. If we take then we get the inequality given in [^{ 17}, Lemma 3.1].

2. If we take and then we get the inequality given in [^{ 20}, Lemma A].

**Theorem 4****.**** **Let* ** *be an open invex subset with respect to* ** *and* ** *with* ** *Suppose* ** *is a differentiable mapping on* ** *such that* * If* * is preinvex on then the following Riemann-Liouville fractional integral inequality holds:

Where

with

Proof. Using Lemma 1 and the preinvexity of we have

So, the proof is completed.

**Remark 2****.**** **In Theorem 4,

1. If we take then we get the inequality given in [^{ 17}, Theorem 4.1].

2. If we take and then we get the inequality given in [^{ 29}, Theorem 2.2].

**Theorem 5****.**** **Let* ** *be an open invex subset with respect to* ** *and* ** *with* ** *Suppose* * is a differentiable mapping on* ** *such that* ** *If* ** *is preinvex on* ** *for* ** *then the following Riemann-Liouville fractional integral inequality holds:

where and are given as Theorem 4 and

Proof. Using Lemma 1, power mean inequality and the preinvexity of we have

This completes the proof.

**Remark 3****.**** **In Theorem 5,* *

1. If we take then we get the inequality given in [^{ 17}, Theorem 4.2].

2. If we take and then we get the inequality given in [^{ 20}, Theorem 1].

**Theorem 6****.**** **Let* ** *be an open invex subset with respect to* ** *and* ** *with* ** *Suppose* ** *is a differentiable mapping on* * such that* ** If ** *is preinvex on* ** *for* ** *then the following Riemann-Liouville fractional integral inequality holds:

Where

with and

Proof. Using Lemma 1, Hölder’s integral inequality and the preinvexity of we have

This completes the proof.

**Remark 4****.**** **In Theorem 6,* *

1. If we take then we get the inequality given in [^{ 17}, Theorem 4.3].

2. If we take and then we get the inequality given in [^{ 29}, Theorem 2.3].

We have derived new fractional Hermite-Hadamard type integral inequalities via preinvex functions involving only the right Riemann-Liouville fractional integral. We have obtained new generalizations of the right side of the Hermite- Hadamard type inequalities for functions whose first derivatives absolute values are preinvex via right Riemann-Liouville fractional integrals. It has shown that previously known results can be obtained as special cases from our results. It is expected that idea of this article may attract interested readers.

The author is thankful to the Editor and anonymous referees for their constructive comments and valuable suggestions. This research article is supported by Kırklareli University Scientific Research Projects Coordination Unit. Project Number: KLUBAP-191.

[1] | Pecaric, J. E., Proschan, F. and Tong, Y. L., Convex Functions, Partial Orderings and Statistical Applications, Academic Press, Boston, 1992. | ||

In article | |||

[2] | Hanson, M. A., On Sufficiency of the Kuhn-Tucker Conditions, J. Math. Anal. Appl., 1 (1981) 545-550. | ||

In article | View Article | ||

[3] | Ben-Israel, A. and Mond, B., What is Invexity, J. Aust. Math. Soc., Ser. B, 28(1) (1986) 1-9. | ||

In article | View Article | ||

[4] | Pini, R., Invexity and Generalized Convexity, Optimization, 22 (1991), 513-523. | ||

In article | View Article | ||

[5] | Weir, T. and Mond, B., Preinvex Functions in Multiple Objective Optimization, J. Math. Anal. Appl., 136 (1998), 29-38. | ||

In article | View Article | ||

[6] | Noor, M. A., Variational Like Inequalities, Optimization, 30 (1994) 323-330. | ||

In article | View Article | ||

[7] | Barani, A., Ghazanfari, A. G. and Dragomir, S. S., Hermite-Hadamard Inequality Through Prequasiinvex Functions, RGMIA Research Report Collection, 14 (2011) Article 48, 7 pp. | ||

In article | |||

[8] | Barani, A., Ghazanfari, A. G. and Dragomir, S. S., Hermite-Hadamard Inequality for Functions Whose Derivatives Absolute Values are Preinvex, RGMIA Research Report Collection, 14 (2011), Article 64, 11 pp. | ||

In article | |||

[9] | Iscan, I., Kadakal, M. and Kadakal, H., On Two Times Differentiable Preinvex and Prequasiinvex Functions, Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat., 68(1) (2019) 950-963. | ||

In article | View Article | ||

[10] | Kadakal, H., Kadakal, M. and Iscan, I., New Type Integral Inequalities for Three Times Differentiable Preinvex and Prequasiinvex Functions, Open J. Math. Anal., 2(1) (2018), 33-46. | ||

In article | View Article | ||

[11] | Latif, M. A. and Shoaib, M., Hermite-Hadamard Type Integral Inequalities for Differentiable m-Preinvex and (α,m)-Preinvex Functions, J. Egyptian Math. Soc., 23 (2015) 236-241. | ||

In article | View Article | ||

[12] | Noor, M. A., Noor, K. I., Awan, M. U. and Li, J., On Hermite-Hadamard Inequalities for h-Preinvex Functions, Filomat, 28(7) (2014), 1463-1474. | ||

In article | View Article | ||

[13] | Noor, M. A., Noor, K. I., Awan, M. U. and Qi, F., Integral Inequalities of Hermite-Hadamard Type for Logarithmically h-Preinvex Functions, Cogent Mathematics, 2(1) (2015), Article Number: 1035856, 10 pages. | ||

In article | View Article | ||

[14] | Ozcan, S., On Refinements of Some Integral Inequalities for Differentiable Prequasiinvex Functions, Filomat, 33(14) (2019), 4377-4385. | ||

In article | View Article | ||

[15] | Kadakal, M., Hermite-Hadamard and Simpson Type Inequalities for Multiplicatively Harmonically P-Functions, Sigma: Journal of Engineering & Natural Sciences, 37(4) (2019), 1311-1320. | ||

In article | View Article | ||

[16] | Kirmaci, U. S., Inequalities for Differentiable Mappings and Applications to Special Means of Real Numbers and to Midpoint Formula, Appl. Math. Comp., 147 (2004) 137-146. | ||

In article | |||

[17] | Kunt, M., Karapinar, D., Turhan, S. and Iscan, I., The Right Riemann-Liouville Fractional Hermite-Hadamard Type Inequalities for Convex Functions, J. Ineq. Spec. Func., 9(1) (2018), 45-57. | ||

In article | View Article | ||

[18] | Ozcan, S., Some Integral Inequalities for Harmonically (α,s)-Convex Functions, J. Func. Spaces, Vol. 2019 (2019) Article ID 2394021, 8 pages. | ||

In article | |||

[19] | Ozcan, S. and Iscan, I., Some New Hermite-Hadamard Type Inequalities for s-Convex Functions and Their Applications, J. Ineq. Appl., Article number: 2019:201 (2019), 11 pages. | ||

In article | View Article | ||

[20] | Pearce, C. E. M. and Pecaric, J., Inequalities for Differentiable Mappings with Application to Special Means and Quadrature Formulae, Appl. Math. Lett. 13 (2000), 51-55. | ||

In article | View Article | ||

[21] | Sarikaya, M. Z. and Budak, H., Generalized Hermite-Hadamard Type Integral Inequalities for Fractional Integrals, Filomat, 30(5) (2016), 1315-1326. | ||

In article | View Article | ||

[22] | Sarikaya, M. Z., Set, E., Yaldiz, H. and Basak, N., Hermite-Hadamard’s Inequalities for Fractional Integrals and Related Fractional Inequalities, Math. Comput. Mod. 57(9) 2013), 2403-2407. | ||

In article | View Article | ||

[23] | Set, E., Iscan, I., Sarikaya, M. Z. and Ozdemir, M. E., On New Inequalities of Hermite-Hadamard-Fejer Type for Convex Functions via Fractional Integrals, Appl. Math. Comp., 259 (2015), 875-881. | ||

In article | View Article | ||

[24] | Zhang, Y. and Wang, J. R., On some new Hermite-Hadamard Inequalities Involving Riemann-Liouville Fractional Integrals, J. Ineq. Appl., Article number: 2013:220 (2013), 27 pages. | ||

In article | View Article | ||

[25] | Yang, X. M. and Li. D., On Properties of Preinvex Functions, J. Math. Anal. Appl., 256 (2001), 229-241. | ||

In article | View Article | ||

[26] | Noor, M. A., Hermite-Hadamard Integral Inequalities for Log-Preinvex Functions, J. Math. Anal. Approx. Theory, 2 (2007) 126-131. | ||

In article | View Article | ||

[27] | Kilbas, A. A., Srivastava, H. M. and Trujillo, J. J., Theory and Applications of Fractional Differential Equations, Elsevier, Amsterdam, 2006. | ||

In article | |||

[28] | Iscan, I., Hermite-Hadamard's Inequalities for Preinvex Functions via Fractional Integrals and Related Fractional Inequalities, American Journal of Mathematical Analysis, 1(3) (2013), 33-38. | ||

In article | |||

[29] | Dragomir, S. S. and Agarwal, R. P., Two Inequalities for Differentiable Mappings and Applications to Special Means of Real Numbers and to Trapezoidal Formula, Appl. Math. Lett. 11(5) (1998), 91-95. | ||

In article | |||

Published with license by Science and Education Publishing, Copyright © 2019 Serap Özcan

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Serap Özcan. Hermite-Hadamard Type Inequalities for Preinvex Functions via Right Riemann-Liouville Fractional Integrals. *Turkish Journal of Analysis and Number Theory*. Vol. 7, No. 6, 2019, pp 140-144. http://pubs.sciepub.com/tjant/7/6/1

Özcan, Serap. "Hermite-Hadamard Type Inequalities for Preinvex Functions via Right Riemann-Liouville Fractional Integrals." *Turkish Journal of Analysis and Number Theory* 7.6 (2019): 140-144.

Özcan, S. (2019). Hermite-Hadamard Type Inequalities for Preinvex Functions via Right Riemann-Liouville Fractional Integrals. *Turkish Journal of Analysis and Number Theory*, *7*(6), 140-144.

Özcan, Serap. "Hermite-Hadamard Type Inequalities for Preinvex Functions via Right Riemann-Liouville Fractional Integrals." *Turkish Journal of Analysis and Number Theory* 7, no. 6 (2019): 140-144.

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[1] | Pecaric, J. E., Proschan, F. and Tong, Y. L., Convex Functions, Partial Orderings and Statistical Applications, Academic Press, Boston, 1992. | ||

In article | |||

[2] | Hanson, M. A., On Sufficiency of the Kuhn-Tucker Conditions, J. Math. Anal. Appl., 1 (1981) 545-550. | ||

In article | View Article | ||

[3] | Ben-Israel, A. and Mond, B., What is Invexity, J. Aust. Math. Soc., Ser. B, 28(1) (1986) 1-9. | ||

In article | View Article | ||

[4] | Pini, R., Invexity and Generalized Convexity, Optimization, 22 (1991), 513-523. | ||

In article | View Article | ||

[5] | Weir, T. and Mond, B., Preinvex Functions in Multiple Objective Optimization, J. Math. Anal. Appl., 136 (1998), 29-38. | ||

In article | View Article | ||

[6] | Noor, M. A., Variational Like Inequalities, Optimization, 30 (1994) 323-330. | ||

In article | View Article | ||

[7] | Barani, A., Ghazanfari, A. G. and Dragomir, S. S., Hermite-Hadamard Inequality Through Prequasiinvex Functions, RGMIA Research Report Collection, 14 (2011) Article 48, 7 pp. | ||

In article | |||

[8] | Barani, A., Ghazanfari, A. G. and Dragomir, S. S., Hermite-Hadamard Inequality for Functions Whose Derivatives Absolute Values are Preinvex, RGMIA Research Report Collection, 14 (2011), Article 64, 11 pp. | ||

In article | |||

[9] | Iscan, I., Kadakal, M. and Kadakal, H., On Two Times Differentiable Preinvex and Prequasiinvex Functions, Commun. Fac. Sci. Univ. Ank. Ser. A1 Math. Stat., 68(1) (2019) 950-963. | ||

In article | View Article | ||

[10] | Kadakal, H., Kadakal, M. and Iscan, I., New Type Integral Inequalities for Three Times Differentiable Preinvex and Prequasiinvex Functions, Open J. Math. Anal., 2(1) (2018), 33-46. | ||

In article | View Article | ||

[11] | Latif, M. A. and Shoaib, M., Hermite-Hadamard Type Integral Inequalities for Differentiable m-Preinvex and (α,m)-Preinvex Functions, J. Egyptian Math. Soc., 23 (2015) 236-241. | ||

In article | View Article | ||

[12] | Noor, M. A., Noor, K. I., Awan, M. U. and Li, J., On Hermite-Hadamard Inequalities for h-Preinvex Functions, Filomat, 28(7) (2014), 1463-1474. | ||

In article | View Article | ||

[13] | Noor, M. A., Noor, K. I., Awan, M. U. and Qi, F., Integral Inequalities of Hermite-Hadamard Type for Logarithmically h-Preinvex Functions, Cogent Mathematics, 2(1) (2015), Article Number: 1035856, 10 pages. | ||

In article | View Article | ||

[14] | Ozcan, S., On Refinements of Some Integral Inequalities for Differentiable Prequasiinvex Functions, Filomat, 33(14) (2019), 4377-4385. | ||

In article | View Article | ||

[15] | Kadakal, M., Hermite-Hadamard and Simpson Type Inequalities for Multiplicatively Harmonically P-Functions, Sigma: Journal of Engineering & Natural Sciences, 37(4) (2019), 1311-1320. | ||

In article | View Article | ||

[16] | Kirmaci, U. S., Inequalities for Differentiable Mappings and Applications to Special Means of Real Numbers and to Midpoint Formula, Appl. Math. Comp., 147 (2004) 137-146. | ||

In article | |||

[17] | Kunt, M., Karapinar, D., Turhan, S. and Iscan, I., The Right Riemann-Liouville Fractional Hermite-Hadamard Type Inequalities for Convex Functions, J. Ineq. Spec. Func., 9(1) (2018), 45-57. | ||

In article | View Article | ||

[18] | Ozcan, S., Some Integral Inequalities for Harmonically (α,s)-Convex Functions, J. Func. Spaces, Vol. 2019 (2019) Article ID 2394021, 8 pages. | ||

In article | |||

[19] | Ozcan, S. and Iscan, I., Some New Hermite-Hadamard Type Inequalities for s-Convex Functions and Their Applications, J. Ineq. Appl., Article number: 2019:201 (2019), 11 pages. | ||

In article | View Article | ||

[20] | Pearce, C. E. M. and Pecaric, J., Inequalities for Differentiable Mappings with Application to Special Means and Quadrature Formulae, Appl. Math. Lett. 13 (2000), 51-55. | ||

In article | View Article | ||

[21] | Sarikaya, M. Z. and Budak, H., Generalized Hermite-Hadamard Type Integral Inequalities for Fractional Integrals, Filomat, 30(5) (2016), 1315-1326. | ||

In article | View Article | ||

[22] | Sarikaya, M. Z., Set, E., Yaldiz, H. and Basak, N., Hermite-Hadamard’s Inequalities for Fractional Integrals and Related Fractional Inequalities, Math. Comput. Mod. 57(9) 2013), 2403-2407. | ||

In article | View Article | ||

[23] | Set, E., Iscan, I., Sarikaya, M. Z. and Ozdemir, M. E., On New Inequalities of Hermite-Hadamard-Fejer Type for Convex Functions via Fractional Integrals, Appl. Math. Comp., 259 (2015), 875-881. | ||

In article | View Article | ||

[24] | Zhang, Y. and Wang, J. R., On some new Hermite-Hadamard Inequalities Involving Riemann-Liouville Fractional Integrals, J. Ineq. Appl., Article number: 2013:220 (2013), 27 pages. | ||

In article | View Article | ||

[25] | Yang, X. M. and Li. D., On Properties of Preinvex Functions, J. Math. Anal. Appl., 256 (2001), 229-241. | ||

In article | View Article | ||

[26] | Noor, M. A., Hermite-Hadamard Integral Inequalities for Log-Preinvex Functions, J. Math. Anal. Approx. Theory, 2 (2007) 126-131. | ||

In article | View Article | ||

[27] | Kilbas, A. A., Srivastava, H. M. and Trujillo, J. J., Theory and Applications of Fractional Differential Equations, Elsevier, Amsterdam, 2006. | ||

In article | |||

[28] | Iscan, I., Hermite-Hadamard's Inequalities for Preinvex Functions via Fractional Integrals and Related Fractional Inequalities, American Journal of Mathematical Analysis, 1(3) (2013), 33-38. | ||

In article | |||

[29] | Dragomir, S. S. and Agarwal, R. P., Two Inequalities for Differentiable Mappings and Applications to Special Means of Real Numbers and to Trapezoidal Formula, Appl. Math. Lett. 11(5) (1998), 91-95. | ||

In article | |||