Mathematical Problems in Engineering
Volume 2020 (2020), Article ID 8596736, 5 pages
https://doi.org/10.1155/2020/8596736

Research Article

Certain Generating Relations Involving the Generalized Multi-Index Bessel–Maitland Function

Shilpi Jain,¹ Juan J. Nieto,² Gurmej Singh,3,4 and Junesang Choi⁵

¹Department of Mathematics, Poornima College of Engineering, Jaipur 302022, India
²Instituto de Matematicas, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
³Department of Mathematics, Mata Sahib Kaur Girls College, Talwandi Sabo, Bathinda 151103, India
⁴Department of Mathematics, Singhania University, Pacheri Bari, Jhunjhunu, India
⁵Department of Mathematics, Dongguk University, Gyeongju 38066, Republic of Korea

Correspondence should be addressed to Juan J. Nieto; juanjose.nieto.roig@usc.es

Received 29 April 2020; Accepted 4 August 2020; Published 25 August 2020

Academic Editor: Luigi Rodino

Copyright © 2020 Shilpi Jain 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.

Generating relations involving the special functions have already proved their important role in mathematics and other fields of sciences. In this paper, we aim to provide some presumably new generating relations in connection with the generalized multi-index Bessel–Maitland function . The main results presented here, being very general, can yield a number of particular or equivalent identities, some of which are explicitly demonstrated.

1. Introduction and Preliminaries

Here and elsewhere, let , , , , and be the sets of complex numbers, real numbers, positive real numbers, positive integers, and nonpositive integers, respectively.

The Bessel–Maitland function is defined as (see Marichev [1])

Pathak [2] gave the following more generalized form of generalized Bessel–Maitland function (1):

Remark 1. Even though Pathak excluded in (2), the case yields (1).
If , , is replaced by , and is replaced by in (2), then generalized Bessel–Maitland function reduces to the Mittag–Leffler function which was studied by Wiman [3] as follows:

If is replaced by and is replaced by in (2), then the generalized Bessel–Maitland function reduces to the well-known generalized Mittag–Leffler function which was introduced by Shukla and Prajapati [4] as follows:

Jain and Agarwal [5] generalized Bessel–Maitland function (1) as follows:

Choi and Agarwal [6] investigated the following generalized multi-index Bessel function:

where and , , , , and such that

Remark 2. It is easily found that generalized multi-index Bessel–Maitland function (9) is equivalent to the generalized multi-index Mittag–Leffler function defined and studied by Saxena and Nishimoto [7] (see also [8]).
Pohlen [9] introduced the Hadamard product (or the convolution) of two analytic functions and as follows:

where . Here, and are analytic at whose Maclaurin series with their respective radii of convergence and are

The concept of the Hadamard product has turned out to be useful, particularly, in factorizing a newborn function, which is usually expressed as a Maclaurin series, into two known functions (see, e.g., [10–13]).
The -th derivative of the function is easily found to be given in terms of gamma function as follows:

Generating functions have been widely used in exploring certain properties and formulas involving sequences and polynomials in a wide range of research subjects. Many researchers have developed a remarkably large number of generating functions associated with a variety of special functions. For some works on this subject, one may refer, for example, to an extensive monograph [14–25] and the literature cited therein. In this search, we aim to provide some presumably new generating relations in connection with generalized multi-index Bessel–Maitland function (9). The main results developed here, being very general, can be reduced to produce a large number of presumably new and potentially useful generating relations for other known functions, some of which are demonstrated.

2. Generating Relations

We give two generating relations involving generalized multi-index Bessel–Maitland function (9) asserted by the following theorems.

Theorem 1. Let and , , , , and such that

Also, let . Then,

Proof. We replace by in the left-hand side of (15) and denote the resulting expression by . Then, using form (9), on expanding the function in series, gives

Differentiating times both sides of (16) with respect to with the aid of (13) (term-by-term differentiation can be verified under the given conditions), we find

which is simplified to yield

Decomposing series (18) into Hadamard product (11), we obtain

Expanding as the Taylor series gives

Combining (16), (19), and (20), we obtain

Finally, setting yields desired result (15).

Theorem 2. Let and , , , , and such that

Also, let . Then,

Proof. Let be the left-hand side of (23). Using (9), on expanding the function in series, gives

Interchanging the order of summations in (24) and using the known identity (see, e.g., [26, p. 5])

we have

Using the generalized binomial expansion, we find that the inner sum in (26) gives

Finally, interpreting (26) with the help of (27) yields desired result (23).

3. Further Remarks

Here, we choose to give some equivalent identities and particular cases of the results in Theorems 1 and 2. As noted in Remark 2, setting by and by in (15) and (23) gives two corresponding generating relations involving the generalized multi-index Mittag–Leffler function , which are asserted, respectively, in Corollaries 1 and 2.

Corollary 1. Let and , , , , and such that

Also, let . Then,

Corollary 2. Let and , , , , and such that

Also, let . Then,

The particular cases of (15), (23), (29), and (31) when give the following generating relations, stated, respectively, in Corollaries 3–6.

Corollary 3. Let , , , , and such that , , , and . Also, let . Then,

Corollary 4. Let , , , , and such that , , , and . Also, let . Then,

Corollary 5. Let , , , , and such that , , , and . Also, let . Then,

Corollary 6. Let , , , , and such that , , , and . Also, let . Then,

Data Availability

No data were used to support this study.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Acknowledgments

This research has been partially supported by the Agencia Estatal de Investigacion (AEI) of Spain, co-financed by the European Fund for Regional Development (FEDER) corresponding to the 2014–2020 multiyear financial framework (project MTM2016-75140-P), and also supported by Xunta de Galicia (grant ED431C 2019/02). Shilpi Jain also thanks SERB (project number: MTR/2017/000194) for providing necessary facility.

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