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Journal of Mathematics

Volume 2013 (2013), Article ID 821762, 5 pages

http://dx.doi.org/10.1155/2013/821762

## Generalized Mittag-Leffler Function Associated with Weyl Fractional Calculus Operators

^{1}Department of Mathematics, Al-Azhar University-Gaza, P.O. Box 1277, Gaza, Palestine^{2}Department of Mathematics, College of Girls Ain Shams University, Cairo, Egypt

Received 8 January 2013; Revised 1 April 2013; Accepted 18 April 2013

Academic Editor: Josefa Linares-Perez

Copyright © 2013 Ahmad Faraj et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

#### Abstract

This paper is devoted to study further properties of generalized Mittag-Leffler function associated with Weyl fractional integral and differential operators. A new integral operator depending on Weyl fractional integral operator and containing in its kernel is defined and studied, namely, its boundedness. Also, composition of Weyl fractional integral and differential operators with the new operator is established.

#### 1. Introduction

In 1903, the Swedish mathematician Mittag-Leffler [1] introduced the function as where and is the gamma function; .

During the last century and due to its involvement in the problems of physics, engineering, and applied sciences, many authors defined and studied in their research papers different generalizations of Mittag-Leffler type function, namely, introduced by Wiman [2], stated by Prabhakar [3], defined and studied by Shukla and Prajapati [4], and investigated by Salim and Faraj [5].

Prabhakar studied some properties of generalized Mittag-Leffler type-function and the fractional integral operator containing in the kernel and applied the result obtained to prove the existence and uniqueness of the solution of corresponding integral equation of the first kind.

Moreover, Kilbas et al. [6] devoted themselves to further investigation of , and the integral operator defined in (2). They established integral representation, differentiation and integration properties of and formulas of its Riemann-Liouville fractional integral and differential operators. For more results and conclusions, one can refer to the work of Srivastava and Tomovski [7].

Recently, Salim and Faraj [5] introduced a new generalization of Mittag-Leffler-type function as where Equation (3) is just a generalized formula of Mittag-Leffler function; its various properties including differentiation, Laplace, Beta, and Mellin transforms, and generalized hypergeometric series form and its relationship with other type of special functions were investigated and established.

On the other hand Salim and Faraj in their research paper defined and studied an integral operator as containing in the kernel. Also, composition of Riemann-Liouville fractional integral and differential operators with the integral operator defined in (5) was established.

This paper is devoted for the study of further properties of the generalized Mittag-Leffler function defined in (3) with another type of fractional calculus operators called Weyl fractional integral and differential operators written as: The last definition can be written in the form Precisely, the authors investigate the basic properties of Weyl fractional integral and differential operator with generalized Mittag-Leffler function ; moreover, a new integral operator depending on Weyl fractional integral operator and containing in its kernel is established as The condition of boundedness of the integral operator (9) is discussed and stated in the space of Lebesgue-measurable functions on Also, composition of Weyl fractional integration and differentiation with the operator defined in (9) is established.

Throughout this paper, we need the following well-known facts and rules.(i) Fubini's theorem (Dirichlet formula) [8] (ii) The Riemann-Liouville fractional integral [8] (iii) The Riemann-Liouville fractional derivative [8] (iv) Beta transform (Sneddon [9]) where , .(v) The Beta function is written as: (vi) The difference property of the Gamma function is

#### 2. Further Properties of Weyl Fractional Integral Related to Mittag-Leffler Function

In this section, we consider composition of Weyl fractional integral and derivative (6) and (7) with generalized Mittag-Leffler function defined in (3).

Theorem 1. *Let ; and , then
*

*Proof. *
Let , then

Theorem 2. *Let , , ; , , , , , and , then
*

*Proof. *Making use of (7), we get
Let , then

#### 3. Weyl Integral Operator with Generalized Mittag-Leffler Function in the Kernel

Consider the Weyl integral operator defined in (9) containing in the kernel. First of all, we prove that the operator is bounded on .

Theorem 3. *Let ; with , , , , and , then the operator is bounded on and
**
where
*

*Proof. *Let denote the th term of (25), then
Hence, as and which means that the right-hand side of (25) is convergent and finite under the given condition.

Now, according to (9), (10), and (11), we get
Let
then
Hence,

We consider now composition of Weyl fractional integration and differentiation with the operator defined in (9) contained in the next two theorems.

*Remark 4. *One can use the result of the next lemma for the proof of the stated theorems (see [5]).

Lemma 5. *Let ; , , , , and , then for , one has
*

Theorem 6. *Let ; with , , , and , then
*

*Proof. *Applying (8) and (9), and by using Dirichlet formula (11) yields
Let
then
Applying (13) and the result of Lemma 5, we get
On the other hand,
Let , we get
Returning to (13) and Lemma 5, we have
which ends the proof.

A similar result concerning the Weyl fractional differentiation is stated in the following theorem.

Theorem 7. *If the condition of Theorem 6 is satisfied, then
*

*Proof. *Making use of (8), we get
and applying Theorem 6 yields
By using Dirichlet formula (12), we get
Repeating this process times, we get

#### References

- G. M. Mittag-Leffler, “Sur la nouvelle function ${E}_{\alpha}(z)$,”
*Comptes Rendus de l'Académie des Sciences*, vol. 137, pp. 554–558, 1903. - A. Wiman, “Über den Fundamentalsatz in der Teorie der Funktionen ${E}_{\alpha}(x)$,”
*Acta Mathematica*, vol. 29, no. 1, pp. 191–201, 1905. View at Publisher · View at Google Scholar · View at MathSciNet - T. R. Prabhakar, “A singular integral equation with a generalized Mittag-Leffler function in the kernel,”
*Yokohama Mathematical Journal*, vol. 19, pp. 7–15, 1971. View at MathSciNet - A. K. Shukla and J. C. Prajapati, “On a generalization of Mittag-Leffler function and its properties,”
*Journal of Mathematical Analysis and Applications*, vol. 336, no. 2, pp. 797–811, 2007. View at Publisher · View at Google Scholar · View at MathSciNet - T. O. Salim and A. W. Faraj, “A generalization of Mittag-Leffler function and integral operator associated with fractional calculus,”
*Journal of Fractional Calculus and Applications*, vol. 3, no. 5, pp. 1–13, 2012. - A. A. Kilbas, M. Saigo, and R. K. Saxena, “Generalized Mittag-Leffler function and generalized fractional calculus operators,”
*Integral Transforms and Special Functions*, vol. 15, no. 1, pp. 31–49, 2004. View at Publisher · View at Google Scholar · View at MathSciNet - H. M. Srivastava and Z. Tomovski, “Fractional calculus with an integral operator containing a generalized Mittag-Leffler function in the kernel,”
*Applied Mathematics and Computation*, vol. 211, no. 1, pp. 198–210, 2009. View at Publisher · View at Google Scholar · View at MathSciNet - S. G. Samko, A. A. Kilbas, and O. I. Marichev,
*Fractional Integrals and Derivatives. Theory and Applications*, Gordon and Breach Science Publishers, Yverdon, Switzerland, 1993. View at MathSciNet - I. N. Sneddon,
*The Use of Integral Transforms*, Tata McGraw Hill, New Delhi, India, 1979.