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Fractional calculus and integral transforms of the product of a general class of polynomial and incomplete Fox–Wright functions
Advances in Difference Equations volume 2020, Article number: 606 (2020)
Abstract
Motivated by a recent study on certain families of the incomplete H-functions (Srivastava et al. in Russ. J. Math. Phys. 25(1):116–138, 2018), we aim to investigate and develop several interesting properties related to product of a more general polynomial class together with incomplete Fox–Wright hypergeometric functions \({}_{p}\Psi _{q}^{(\gamma )}(\mathfrak{t})\) and \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\) including Marichev–Saigo–Maeda (M–S–M) fractional integral and differential operators, which contain Saigo hypergeometric, Riemann–Liouville, and Erdélyi–Kober fractional operators as particular cases regarding different parameter selection. Furthermore, we derive several integral transforms such as Jacobi, Gegenbauer (or ultraspherical), Legendre, Laplace, Mellin, Hankel, and Euler’s beta transforms.
1 Introduction
In a variety of diverse fields, together with engineering science, material science, mathematical physics, chemistry, and biology, the concept of differential equations (including fractional order) and their application have played an important role, see [5, 14, 18, 41–48]. In addition, the special functions of one or more variables are also important because they occur as solutions to these simulated differential equations. Therefore, with the development of new problems in the area of technologies in engineering and applied sciences, the subject of special functions is very diverse and is continuously growing. As a result, a number of articles on these concepts and their future implementations have been made available in the literature, see [1–4, 39, 40]. Incomplete special functions have additionally been utilized to a wide range of problems, and numerous scientific studies on incomplete special functions, along with related higher transcendental special functions, have currently been published by various authors [6–12, 15, 20–23, 31, 35–38]. In particular, the incomplete Fox–Wright functions \({}_{p}\Psi _{q}^{(\gamma )}(\mathfrak{t})\) and \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\) with p numerator and q denominator parameters are stated as follows [23, 35]:
and
with
The incomplete Fox–Wright functions \({}_{p}\Psi _{q}^{(\gamma )}(\mathfrak{t})\) and \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\) in (1.1) and (1.2) satisfy the decomposition formula
where \({}_{p}\Psi _{q} [\mathfrak{t}]\) is the Fox–Wright function [16].
Also, the normalized incomplete Fox–Wright functions \({}_{p}\Psi _{q}^{*(\gamma )} (\mathfrak{t})\) and \({}_{p}\Psi _{q}^{*(\Gamma )} (\mathfrak{t})\) are given by [23, 35]
and
Let \(S_{n}^{m}[\mathfrak{u}]\) denote the general family of polynomials made known through Srivastava [30]:
Here, m is a positive integer (arbitrary), the coefficients \(A_{n,s}\in \mathbb{R}\) (or \(\mathbb{C}\)) are constants (arbitrary), and \((\lambda )_{\nu }= \frac{\Gamma (\lambda +\nu )}{\Gamma (\lambda )}\) (\(\lambda ,\nu \in \mathbb{C}\)) denotes the shifted factorial (or the Pochhammer symbol). Also, the above polynomials provide a large number spectrum of well-known polynomials as one of its particular cases on appropriately specializing the coefficient \(A_{n,s}\). Particularly, by setting \(m=1\), \(A_{n, s}=\frac{s!}{(-n)_{m s}}\) for \(s=k\) and \(A_{n, s}=0\) for \(s\neq k\), the general class of polynomials leads to a power function, i.e.,
Taking into account formula (1.3), it is also appropriate to study the characteristics and properties of the incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\).
2 Fractional integral and differential operators
We recall a general pair of fractional integral and differential operators popularly known as Marichev–Saigo–Maeda (M-S-M), which involve, in their kernel, third Appell’s two-variable hypergeometric function \(F_{3}(.)\) and are defined by [32]
Here, we mention and study left-hand-sided fractional integral and differential operators(see, for details, [19, 26, 28]).
Definition 1
For \(\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta \in \mathbb{C}\) and \(x>0\) with \(\Re (\eta )>0\), the left-hand-sided Marichev–Saigo–Maeda (M–S–M) fractional integral and differential operators are respectively defined as
and
where \(\kappa =[\Re (\eta )]+1\) and \([\Re (\eta )]\) denotes the integer part of \(\Re (\eta )\).
The preceding results are well known and can be used as a proof of subsequent theorems.
Lemma
Let \(\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta , \lambda \in \mathbb{C}\) such that \(\Re (\eta )>0\).
-
(a)
If \(\Re (\lambda )> \max \{0, \Re (\sigma ^{\prime }-\rho ^{\prime }), \Re (\sigma +\sigma ^{ \prime }+\rho -\eta )\}\), then
$$ \begin{aligned}[b] &\bigl(\mathcal{I}_{0+}^{\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta } \mathfrak{t}^{\lambda -1} \bigr) ( \mathfrak{X}) \\ &\quad = \frac{\Gamma (\lambda )\Gamma (-\sigma ^{\prime }+ \rho ^{\prime }+\lambda )\Gamma (-\sigma -\sigma ^{\prime }-\rho +\eta +\lambda )}{\Gamma (\rho ^{\prime }+\lambda )\Gamma (-\sigma -\sigma ^{\prime }+\eta +\lambda )\Gamma (-\sigma ^{\prime }-\rho +\eta +\lambda )} \mathfrak{X}^{-\sigma -\sigma ^{\prime }+\eta +\lambda -1}. \end{aligned} $$(2.4) -
(b)
If \(\Re (\lambda )> \max \{0, \Re (-\sigma +\rho ), \Re (-\sigma -\sigma ^{\prime }-\rho ^{ \prime }+\eta )\}\), then
$$ \begin{aligned}[b] &\bigl(\mathcal{D}_{0+}^{\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta } \mathfrak{t}^{\lambda -1} \bigr) ( \mathfrak{X}) \\ &\quad = \frac{\Gamma (\lambda )\Gamma (\sigma -\rho +\lambda )\Gamma (\sigma +\sigma ^{\prime }+\rho ^{\prime }-\eta +\lambda )}{\Gamma (-\rho +\lambda )\Gamma (\sigma +\sigma ^{\prime }-\eta +\lambda )\Gamma (\sigma +\rho ^{\prime }-\eta +\lambda )} \mathfrak{X}^{\sigma +\sigma ^{\prime }-\eta +\lambda -1}. \end{aligned} $$(2.5)
Firstly, we shall investigate the left-hand-sided Marichev–Saigo–Maeda (M–S–M) fractional integral and differential operators of the product of a general family of polynomial along with incomplete Fox–Wright functions \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\).
Theorem 1
Let \(\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta , \lambda \in \mathbb{C}\) be such that \(\Re (\eta ), \mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (\sigma ^{\prime }-\rho ^{\prime }-s\mu ), \Re (\sigma +\sigma ^{\prime }+\rho -\eta -s\mu )\}\). Thereupon, for \(\mathfrak{X}>0\),
Proof
For the sake of simplicity, let us consider
Now, using (1.2) and (1.6) in (2.7) and then taking advantage of relationship (2.4), we find for \(\mathfrak{X}>0\)
Finally, in opinion of (1.2) interpretation, we get (2.6) as a desired outcome. □
Theorem 2
Let \(\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta , \lambda , c \in \mathbb{C}\) be such that \(\mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (-\sigma +\rho -s\mu ), \Re (-\sigma - \sigma ^{\prime }-\rho ^{\prime }+\eta -s\mu )\}\). Then, for \(\mathfrak{X}>0\),
Proof
For the sake of simplicity, let us consider
Now using (1.2) and (1.6) in (2.9) and then taking advantage of relationship (2.5), for \(\mathfrak{X}>0\), we acquire
Finally, in opinion of the (1.2) interpretation, we get (2.8) as a desired outcome. □
The \(F_{3}\) Appell function in (2.1) tends to reduce to the hypergeometric function \({}_{2}F_{1} \) of Gauss as follows:
In the light of the reduction formula (2.10), the Marichev–Saigo–Maeda operators (2.2) including (2.3) reduce to Saigo’s hypergeometric fractional operators. If we take \(\sigma =\sigma +\rho \), \(\sigma '=\rho '=0\), \(\rho =-\eta \), \(\eta =\sigma \), we immediately obtain Saigo’s fractional integral along with differential operators in conjunction with the hypergeometric function \({}_{2}F_{1}\) [26, 27]:
and
Furthermore, by specializing the parameters in (2.11) and (2.12), we obtain Riemann–Liouville and Erdélyi–Kober fractional operators. Setting \(\rho =-\sigma \) in (2.11) and (2.12) yields the familiar Riemann–Liouville integrals and derivatives of fractional order \(\sigma \in \mathbb{C}\) beside \(\Re (\sigma ) > 0\) as well as \(\mathfrak{X} \in \mathbb{R}^{+}\) (see, e.g., [17]):
and
Again setting \(\rho =0\) in (2.11) and (2.12) provides the so-called Erdélyi–Kober integrals and derivatives of fractional order \(\sigma \in \mathbb{C}\) along with \(\Re (\sigma ) > 0\) and \(\mathfrak{X} \in \mathbb{R}^{+}\) (see, e.g., [34]):
and
Here, we mention these results in form of Corollaries 2.1 to 2.6.
Corollary 2.1
Let \(\sigma , \rho , \eta , \lambda \in \mathbb{C}\) be such that \(\Re (\sigma ), \mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (\rho -\eta -s\mu ) \}\). Thereupon, for \(\mathfrak{X}>0\),
Corollary 2.2
Suppose \(\sigma , \eta , \lambda \in \mathbb{C}\) to be such that \(\Re (\sigma ), \mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (-\sigma -\eta -s\mu ) \}\). Thereupon, for \(\mathfrak{X}>0\),
Corollary 2.3
Let \(\sigma , \eta , \lambda \in \mathbb{C}\) be such that \(\Re (\sigma ), \mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (-\eta -s\mu ) \}\). Thereupon, for \(\mathfrak{X}>0\),
Corollary 2.4
Let \(\sigma , \rho , \eta , \lambda \in \mathbb{C}\) be such that \(\mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (-\sigma -\rho -\eta -s\mu )\}\). Then, for \(\mathfrak{X}>0\),
Corollary 2.5
Let \(\sigma , \eta , \lambda \in \mathbb{C}\) be such that \(\mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (-\eta -s\mu )\}\). Then, for \(\mathfrak{X}>0\),
Corollary 2.6
Let \(\sigma , \eta , \lambda \in \mathbb{C}\) be such that \(\mu , \nu >0\) and \(\Re (\lambda )> \max \{\Re (-s\mu ), \Re (-\sigma -\eta -s\mu )\}\). Thereupon, for \(\mathfrak{X}>0\),
3 Integral transforms
In this part, several integral transforms such as Jacobi, Gegenbauer (or ultraspherical), Legendre, Laplace, Mellin, Hankel, and Euler’s beta transforms of a product of a general polynomial class and incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\) are presented.
3.1 Jacobi and related integral transforms
The classical orthogonal Jacobi polynomial \(P^{(\mathfrak{h},\mathfrak{g})}_{n}(\mathfrak{t})\) is given by the following (see, for example, [33]):
where \({}_{2}{F}_{1}\) is the Gauss hypergeometric function [25].
Definition 2
The Jacobi transformation of a \(f(\mathfrak{t})\) function is set as follows (see, e.g., [13, p. 501]):
provided that the \(f(\mathfrak{t})\) function seems to be so limited that only the integral exists in (3.2).
The Jacobi transform of the power function \(\mathfrak{t}^{\rho -1}\) is given by (see, e.g., [37, p. 128, Eq. (18)])
where \(F_{p:l;\mu }^{q:m;\nu } \) corresponds to Kampé de Fériet’s function in two variables (see, e.g., [32, p. 22, Eq. 1.3(2)] and [32, p. 37, Eq. 1.4(21)]). In fact, this last integral formula (3.3) will be reduced instantly to the preceding form when specifying \(\xi =\mathfrak{h}+1\) and \(\eta =\mathfrak{g}+1\):
However, in its additional limited case where \(\rho =m+ 1\) (\(m \in \mathbb{N}_{0}\)), (3.4) brings the established consequence about the \(\mathfrak{t}^{m}\) (\(m \in \mathbb{N}_{0}\)) Jacobi transform studied by [25, p. 261, Eq. (14) along with (15)]:
Specifying the parameters \(\mathfrak{h}\) and \(\mathfrak{g}\), the Jacobi polynomials \(P^{(\mathfrak{h},\mathfrak{g})}_{n}(\mathfrak{t})\) exhibit, like in their individual cases, other such recognized orthogonal polynomials being the Gegenbauer (or ultraspherical) polynomials \(C^{\nu }_{n}(\mathfrak{t})\), the Legendre (or spherical) polynomials \(P_{n}(\mathfrak{t})\), and the Tchebycheff polynomials \(T_{n}(\mathfrak{t})\) and \(U_{n}(\mathfrak{t})\) of the first kind and second kind (see, for details, [33]). In addition, we have the accompanying established connections with the Gegenbauer polynomials \(C^{\nu }_{n}(\mathfrak{\mathfrak{t}})\) as well as the Legendre polynomials \(P_{n}(\mathfrak{\mathfrak{t}})\):
and
respectively, which, in conjunction with (3.2), brings the Gegenbauer transform \(\mathbb{G}^{(\nu )}[f(\mathfrak{t}); n]\) as follows:
and the resulting Legendre transform \(\mathbb{L}[f(\mathfrak{t}); n]\) which is described by
We are now generating three new results that provide the relations between Jacobi, Gegenbauer, and Legendre transforms with the following incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}\) (1.2).
Theorem 3
The preceding formula for Jacobi transform is valid under the condition stated in (1.2):
where the Jacobi transform into (3.4) is assumed to exist.
Proof
By employing the concept of (3.2) together with (1.2), we get
where, when adjusting the order of integration and summation (that might be easily explained by absolute convergence), we make use of the Jacobi transform formula (3.4) along with the parameter ρ substituted by \(\rho +k\) (\(\rho \in \mathbb{C};k\in \mathbb{N}_{0}\)). □
By employing the Jacobi transform formula (3.5), we can simplify the assertion (3.10) of Theorem 3 in their limiting case when \(\rho =m+ 1\) (\(m \in \mathbb{N}_{0}\)). Furthermore, in light of connection (3.6), Theorem 3 gives the subsequent corollary by considering \(\mathfrak{h}=\mathfrak{g}= \nu -\frac{1}{2}\).
Corollary 3.1
The following Gegenbauer transform formula holds true under the condition stated in (1.2):
where it is assumed that the Gegenbauer transform in (3.12) exists.
A special case of Theorem 3 when \(\mathfrak{h}=\mathfrak{g}=0\) (or, alternatively, Corollary 3.1 with \(\nu =\frac{1}{2}\)) gives the following result for the Legendre transform described by (3.9).
Corollary 3.2
The subsequent Legendre transform formula holds true under the condition stated in (1.2):
where it is assumed that the Legendre transform in (3.13) exists.
3.2 Laplace transform
The Laplace transform of a given function \(f(\mathfrak{t})\) is defined as follows [13, 29]:
if the improper integral exists.
Theorem 4
If \(\Delta >0\), \(\alpha >0\), \(\beta >0\), and \(\Re (\omega )>0\), then the Laplace transform of incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}\) is given as follows:
Proof
Using the definition of (1.2) and (1.6) in the left-hand side of (3.15) and applying the definition of Laplace transform (3.14), we obtain
Now, employing the gamma function formula [25]
and then using (1.2), we arrive at the desired result in Theorem 4. □
3.3 Mellin transform
The Mellin transform of a given function \(f(\mathfrak{t})\) is represented as follows [13, 29]:
given that the improper integral exists.
Theorem 5
If \(\Delta >0\), \(\mathfrak{h}>0\), \(\mathfrak{g}>0\), \(\alpha >0\), \(\beta >0\), and \(\Re (\omega )>0\), then the Mellin transform of incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}\) is given as follows:
Proof
Using the definition of (1.2), (1.6) and applying Mellin transform (3.17) in the left-hand side of (3.18) and then employing the beta function formula [25]
after using definition (1.2), we obtain the desired formula in Theorem 5. □
3.4 Hankel transform
The Hankel transform of a given function \(f(\mathfrak{t})\) is characterized as follows [13, 29]:
provided that the improper integral exists, \(J_{\nu }(\omega \mathfrak{t})\) is the Bessel function of order ν.
Theorem 6
If \(\Delta >0\), \(\alpha >0\), \(\beta >0\), \(\lambda >0\), and \(\Re (\omega )>0\), then the Hankel transform of incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}\) is given as follows:
Proof
Using the definition of (1.2), (1.6) and applying Hankel transform (3.20) in the left-hand side of (3.21) and then employing the formula (Prudnikov, Brychkov, and Marichev [24, (2.44)])
we are led easily to the right-hand side of the assertion (3.21) of Theorem 6. The details are omitted here. □
3.5 Euler’s beta transform
The integral transform of Euler’s beta type for a given function \(f(\mathfrak{t})\) is characterized as follows [13, 29]:
Theorem 7
If \(\Delta >0\), \(\mathfrak{h}>0\), \(\mathfrak{g}>0\), \(\mu >0\), \(\nu >0\), \(\xi >0\), \(\eta >0\), and \(\Re (\alpha ), \Re (\beta )>0\), then Euler’s beta type transform of incomplete Fox–Wright function \({}_{p}\Psi _{q}^{(\Gamma )}\) is given as follows:
Proof
Using the definition of (1.2), (1.6) and applying Euler’s beta transform (3.23) in the left-hand side of (3.24) and then employing the beta function formula [25]
after using definition (1.2), we arrive at the desired formula in Theorem 7. □
4 Concluding remarks and observations
In our present study, with the aid of the incomplete Fox–Wright functions \({}_{p}\Psi _{q}^{(\gamma )}(\mathfrak{t})\) and \({}_{p}\Psi _{q}^{(\Gamma )}(\mathfrak{t})\), we have studied several interesting properties, such as Marichev–Saigo–Maeda left-handed fractional integral and differential operators, which include Saigo hypergeometric fractional integral and differential operators, Riemann–Liouville, and Erdélyi–Kober fractional integral and differential operators as particular cases for various choices of parameter. In a similar pattern, one can derive results for right-hand-sided Marichev–Saigo–Maeda, Saigo hypergeometric fractional, Riemann–Liouville, and Erdélyi–Kober fractional integral and differential operators. Furthermore, we derive several integral transforms such as Jacobi, Gegenbauer (or ultraspherical), Legendre, Laplace, Mellin, Hankel, and Euler’s beta transforms. Specific cases of derived findings can be developed by suitably specializing the coefficient \(A_{n,s}\) to obtain a large number of spectrum of the known polynomials (see, e.g. [30]). Here we give three main results, and we left the remaining ones for interested readers. If we set \(n = 0\) and \(A_{0,0}\) (the polynomial family \(S_{0}^{m}\) will reduce to unity) in Theorems 1, 2, and 3, we get the following corollaries.
Corollary 7.1
Let \(\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta , \lambda \in \mathbb{C}\) be such that \(\Re (\eta ), \mu , \nu >0\) and \(\Re (\lambda )> \max \{0, \Re (\sigma ^{\prime }-\rho ^{\prime }), \Re (\sigma +\sigma ^{ \prime }+\rho -\eta )\}\). Thereupon, for \(\mathfrak{X}>0\),
Corollary 7.2
Let \(\sigma , \sigma ^{\prime }, \rho , \rho ^{\prime }, \eta , \lambda , c \in \mathbb{C}\) be such that \(\mu , \nu >0\) and \(\Re (\lambda )> \max \{0, \Re (-\sigma +\rho ), \Re (-\sigma -\sigma ^{\prime }-\rho ^{ \prime }+\eta )\}\). Then, for \(\mathfrak{X}>0\),
Corollary 7.3
The coming Jacobi transform formula holds true under the condition stated in (1.2):
where it is considered that the Jacobi transform in (3.4) exists.
Remark 1
It is important to note that the particular cases of the results obtained in this paper for \(x = 0\) would give the corresponding new results for the product of a more general class of polynomials and Fox–Wright hypergeometric functions \({}_{p}\Psi _{q}(\mathfrak{t})\).
Availability of data and materials
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This work is carried out under the Competitive Research Scheme (CRS) by the TEQIP-III (ATU) Rajasthan Technical University Kota under sanction number TEQIP-III/RTU(ATU)CRS/2019-20/50.
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Jangid, K., Parmar, R.K., Agarwal, R. et al. Fractional calculus and integral transforms of the product of a general class of polynomial and incomplete Fox–Wright functions. Adv Differ Equ 2020, 606 (2020). https://doi.org/10.1186/s13662-020-03067-0
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DOI: https://doi.org/10.1186/s13662-020-03067-0