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Generating functions for some families of the generalized Al-Salam–Carlitz q-polynomials
Advances in Difference Equations volume 2020, Article number: 498 (2020)
Abstract
In this paper, by making use of the familiar q-difference operators \(D_{q}\) and \(D_{q^{-1}}\), we first introduce two homogeneous q-difference operators \(\mathbb{T}(\mathbf{a},\mathbf{b},cD_{q})\) and \(\mathbb{E}(\mathbf{a},\mathbf{b}, cD_{q^{-1}})\), which turn out to be suitable for dealing with the families of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\). We then apply each of these two homogeneous q-difference operators in order to derive generating functions, Rogers type formulas, the extended Rogers type formulas, and the Srivastava–Agarwal type linear as well as bilinear generating functions involving each of these families of the generalized Al-Salam–Carlitz q-polynomials. We also show how the various results presented here are related to those in many earlier works on the topics which we study in this paper.
1 Introduction, definitions, and preliminaries
The quantum (or q-) polynomials constitute a very interesting set of special functions and orthogonal polynomials. Their generating functions appear in several branches of mathematics and physics (see, for details, [1–5]) such as (for example) continued fractions, Eulerian series, theta functions, elliptic functions, quantum groups and algebras, discrete mathematics (including combinatorics and graph theory), coding theory, and so on.
Recently, new classes of special functions including (for example) q-hybrid special polynomials, q-Sheffer–Appell polynomials, twice-iterated 2D q-Appell polynomials, and a unified class of Apostol type q-polynomials were introduced in [6–8] and [9] in which some properties of the introduced polynomials were derived. For more information, the interested reader should refer to [6–8] and [9].
In the year 1997, Chen and Liu [10] developed a method of deriving basic (or q-) hypergeometric identities by parameter augmentation, which may be viewed as being analogous to the method used rather extensively in the theory of ordinary hypergeometric functions and hypergeometric generating functions (see, for details, [5]). Subsequent investigations along the lines developed in [10] can be found in [11–15] and [16]. The main objective of this paper is to investigate two families of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf {b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) by first representing them by the homogeneous q-difference operators \(\mathbb{T}(\mathbf {a},\mathbf{b},cD_{q})\) and \(\mathbb{E}(\mathbf{a},\mathbf{b},cD_{q^{-1}})\), which we have introduced here. We then derive a number of q-identities such as (among other results) generating functions, Rogers type formulas, two kind of the extended Rogers type formulas, and Srivastava–Agarwal type generating functions for each of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf {b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\).
Here, in this paper, we adopt the common conventions and notations on q-series and q-hypergeometric functions. For the convenience of the reader, we provide a summary of mathematical notations and definitions, basic properties, and other relations to be used in the sequel. We refer, for details, to the general references (see [2, 17, 18]) for the definitions and notations. Throughout this paper, we assume that \(|q|< 1\).
For complex numbers a, the q-shifted factorials are defined by
where (see, for example, [2] and [19])
and
We adopt the following notation:
Also, for m large, we have
The q-numbers and the q-factorials are defined as follows:
The q-binomial coefficient is defined as follows (see, for example, [2]):
The basic (or q-) hypergeometric function of the variable z and with \(\mathfrak{r}\) numerator and \(\mathfrak{s}\) denominator parameters is defined as follows (see, for details, the monographs by Slater [19, Chap. 3] and by Srivastava and Karlsson [18, p. 347, Eq. (272)]; see also [20, 21] and [17]):
where \(q\neq0\) when \({\mathfrak {r} }>{\mathfrak {s}}+1\). We also note that
Here, in our present investigation, we are mainly concerned with the Cauchy polynomials \(p_{n}(x,y)\) as given below (see [22] and [2]):
together with the following Srivastava–Agarwal type generating function (see also [23]):
For \(\lambda=0\) in (1.5), we get the following simpler generating function [22]:
The generating function (1.6) is also a homogeneous version of the Cauchy identity or the following q-binomial theorem (see, for example, [2, 19] and [18]):
Upon further setting \(a=0\), this last relation (1.7) becomes Euler’s identity (see, for example, [2])
and its inverse relation is given as follows [2]:
The Jackson’s q-difference or q-derivative operators \(D_{q}\) and \(D_{q^{-1}}\) are defined as follows (see, for example, [2, 24, 25]):
Evidently, in the limit when \(q\rightarrow1-\), we have
provided that the derivative \(f'(x)\) exists.
Suppose that \(D_{q}\) acts on the variable a. Then we have the q-identities asserted by Lemma 1.
Lemma 1
Each of the following q-identities holds true for the q-derivative operator \(D_{q}\)acting on the variable a:
and
The Leibniz rules for the q-derivative operators \(D_{q}\) and \(D_{q^{-1}}\) are given by (see, for example, [10] and [12])
and
where \(D_{q}^{0}\) and \(D_{q^{-1}}^{0}\) are understood to be the identity operators.
Lemma 2
Suppose that q-difference operator \(D_{q}\)acts on the variable a. Then
and
Proof
Suppose that the operator \({D}_{q}\) acts upon the variable a. In light of (1.15), we then find that
where we have appropriately applied formulas (1.11), (1.13), and (1.3). The proof of the first assertion (1.17) of Lemma 2 is completed by using relation (1.21) in (1.19).
Similarly, by using relation (1.16), we have
where we have appropriately used relation (1.3).
Finally, by using relation (1.22) in (1.20), we are led to the second assertion (1.18) of Lemma 2. We thus have completed the proof of Lemma 2. □
Remark 1
For \(s=0\) and \(\omega=s\), assertions (1.17) and (1.18) of Lemma 2 reduce to assertions (1.11) and (1.12) of Lemma 1. Moreover, for \(\omega=0\), assertions (1.17) and (1.18) of Lemma 2 reduce to assertions (1.13) and (1.14) of Lemma 1.
Lemma 3
(see, for example, [2, Eq. (0.58) and Eq. (II.6)])
The q-Chu–Vandermonde formulas are given by
and
We now state and prove the q-difference formulas asserted by Theorem 1.
Theorem 1
Suppose that the q-difference operators \({D}_{q}\)and \(D_{q^{-1}}\)act upon the variable a. Then
and
Proof
Suppose first that the q-difference operator \({D}_{q}\) acts upon the variable a. Then, in light of (1.15), and by using relations (1.17) and (1.11), it is easily seen that
Similarly, by using (1.16), we find for the q-difference operator \(D_{q^{-1}}\) acting on the variable a that
where we have appropriately used relation (1.3) as well.
Equations (1.25) and (1.26) together complete the proof of Theorem 1. □
Remark 2
Upon first setting \(\omega=0\), we put \(t=\omega\) in assertion (1.23) of Theorem 1. Then, if we make use of identity (1.21), we get (1.17). Furthermore, upon setting \(s=0\) in assertion (1.24) of Theorem 1, if we make use of the q-Chu–Vandermonde formula (1.22), we get (1.18).
This paper is organized as follows. In Sect. 2, we introduce two homogeneous q-difference operators \(\mathbb{T}(\mathbf{a},\mathbf{b},cD_{q})\) and \(\mathbb{E}(\mathbf{a},\mathbf{b},cD_{q^{-1}})\). In addition, we define two families of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf {a},\mathbf{b})}(x,y|q)\) and represent each of the families in terms of the homogeneous q-difference operators \(\mathbb{T}(\mathbf{a},\mathbf{b},cD_{q})\) and \(\mathbb{E}(\mathbf{a},\mathbf{b},cD_{q^{-1}})\). We also derive generating functions for these families of the generalized Al-Salam–Carlitz q-polynomials. In Sect. 3, we first give the Rogers type formulas and the extended Rogers type formulas. The Srivastava–Agarwal type generating functions involving the generalized Al-Salam–Carlitz q-polynomials are derived in Sect. 4. Finally, in our last section (Sect. 5), we present the concluding remarks and observations concerning our present investigation.
2 Generalized Al-Salam–Carlitz q-polynomials
In this section, we first introduce two homogeneous q-difference operators \(\mathbb{T}(\mathbf{a},\mathbf{b},cD_{q})\) and \(\mathbb{E}(\mathbf{a},\mathbf{b},cD_{q^{-1}})\) which are defined by
and
where, for convenience,
We now derive identities (2.3) and (2.4), which will be used later in order to derive the generating functions, the Rogers type formulas, the extended Rogers type formulas, and the Srivastava–Agarwal type generating functions involving the families of the generalized Al-Salam–Carlitz q-polynomials.
Theorem 2
Suppose that the q-difference operator \(D_{q}\)acts on the variable a. Then
and
Proof
Suppose that the operators \(D_{q}\) and \(D_{q^{-1}}\) act on the variable a. We observe by applying (1.23) that
Similarly, by applying (1.24), we find that
as asserted by Theorem 2. □
Definition
In terms of the q-binomial coefficient, the families of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) are defined by
and
Proposition
Suppose that the operators \(D_{q}\)and \(D_{q^{-1}}\)act on the variable y. Then
in terms of operators (2.1) and (2.2).
Theorem 3
(Generating function for \(\phi_{n}^{(\mathbf{a}, \mathbf{b})}(x,y,z|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y,z|q)\))
Each of the following generating functions holds true:
and
In our proof of Theorem 3, the following easily derivable lemma will be needed.
Lemma 4
Suppose that the operators \(D_{q}\)and \(D_{q^{-1}}\)act on the variable a. Then
and
Proof of Theorem 3
We suppose that the q-difference operator \({D}_{q}\) acts upon the variable y. In light of the formulas in (2.9), and by applying (2.12), it is readily seen that
Similarly, we have
The proof of Theorem 3 can now be completed by making use of relation (2.13). □
3 The Rogers type formulas and the extended Rogers type formulas
In this section, we use the assertions in (2.9) to derive several q-identities such as the Rogers type formulas and the extended Rogers type formulas for the families of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\).
Theorem 4
(Rogers type formula for \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\))
The following Rogers type formula holds true for \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\):
Theorem 5
(Rogers type formula for \(\psi_{n}^{(\mathbf{a}, \mathbf{b})}(x,y|q)\))
The following Rogers type formula holds true for \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\):
In order to prove Theorems 4 and 5, we need Lemma 5.
Lemma 5
It is asserted that
and
Proof
The first assertion (3.3) of Lemma 5 follows from (2.3) when \(s=0\). On the other hand, the second assertion (3.4) of Lemma 5 can be deduced from (2.4) by setting \(\omega= 0\). □
Proof of Theorems 4 and 5
We suppose that the operator \({D}_{q}\) acts upon the variable y. Then, in view of the formulas in (2.9), we have
The proof of assertion (3.1) of Theorem 4 can now be completed by using relation (3.3) in (3.5).
Similarly, we observe that
which evidently completes the proof of assertion (3.2) of Theorem 5. □
We next derive another Rogers type formula for the family of the generalized Al-Salam–Carlitz q-polynomials \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) as follows.
Theorem 6
(Another Rogers type formula for \(\psi_{n}^{(\mathbf{a}, \mathbf{b})}(x,y|q)\))
It is asserted that
Proof
We suppose that the q-difference operator \({D}_{q}\) acts upon the variable y. We then obtain
The proof of assertion (3.7) of Theorem 6 can now be completed by applying formula (2.4) with \(s=0\) and \(\omega=s\) in (3.8). □
Another extended Rogers type formula for the family of the generalized Al-Salam–Carlitz q-polynomials \(\Psi_{n}^{(\mathbf{a}, \mathbf{b})}(x,y|q)\) is given by Theorem 7.
Theorem 7
(Another extended Rogers type formula for \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\))
It is asserted that
Proof
We suppose that the operator \({D}_{q}\) acts upon the variable y. By using formulas (2.9), we obtain
Thus, in light of (2.4), the proof of assertion (3.9) of Theorem 7 is completed. □
4 Srivastava–Agarwal type generating functions for the families of the Al-Salam–Carlitz q-polynomials
In this section, we use the formulas in (2.9) to derive the Srivastava–Agarwal type generating functions involving the families of the Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\).
The Hahn polynomials (see [26, 27], and [28]) (or, equivalently, the Al-Salam–Carlitz q-polynomials [29]) are defined as follows:
Recently, Srivastava and Agarwal [30] gave a generating function which we recall here as Lemma 6.
Lemma 6
(see [30, Eq. (3.20)])
The following generating function holds true:
The generating function (4.2) is known as a Srivastava–Agarwal type generating function (see, for example, [23]).
In this section, we give the Srivastava–Agarwal type generating functions for the families of the Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\).
Theorem 8
(Srivastava–Agarwal type generating functions for \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\))
The following Srivastava–Agarwal type generating functions hold true for the families of the Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\)and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\):
and
Proof
We suppose that the operator \({D}_{q}\) acts upon the variable y. According to the formulas in (2.9), we then obtain
Now, setting \(\omega=0\) in (2.3), we have
which, in conjunction with (4.5), completes the proof of the first assertion (4.3) of Theorem 8.
The proof of the second assertion (4.4) of Theorem 8 is much akin to that of the first assertion (4.3). The details involved are, therefore, omitted here. □
Remark 3
Upon replacing t by λt, if we set \(s=t\) in assertion (3.7) of Theorem 6, we get (4.4).
Theorem 9
(Srivastava–Agarwal type bilinear generating function for \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\))
The following Srivastava–Agarwal type bilinear generating function holds true for the family of the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\):
Proof
We suppose that the q-difference operator \({D}_{q}\) acts upon the variable y. We then find that
The proof of assertion (4.7) of Theorem 9 is now completed by making use of relation (2.3) in (4.8). □
Theorem 10
(Srivastava–Agarwal type bilinear generating function for \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\))
The following Srivastava–Agarwal type bilinear generating function holds true for the family of the generalized Al-Salam–Carlitz q-polynomials \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\):
Proof
We suppose that the q-difference operator \({D}_{q}\) acts upon the variable y. We then obtain
The proof of assertion (4.9) of Theorem 10 can now be completed by making use of relation (2.4) in (4.10). □
5 Concluding remarks and observations
Our present investigation is motivated essentially by several recent studies of generating functions and other results for various families of basic (or q-) polynomials stemming mostly from the works by Hahn (see, for example, [26, 27] and [28]; see also Al-Salam and Carlitz [29], Srivastava and Agarwal [30], Cao and Srivastava [23], and other researchers cited herein).
In terms of the familiar q-difference operators \(D_{q}\) and \(D_{q^{-1}}\), we have first introduced two homogeneous q-difference operators \(\mathbb{T}(\mathbf{a},\mathbf{b},cD_{q})\) and \(\mathbb{E}(\mathbf{a},\mathbf{b}, cD_{q^{-1}})\), which turn out to be suitable for dealing with the generalized Al-Salam–Carlitz q-polynomials \(\phi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\) and \(\psi_{n}^{(\mathbf{a},\mathbf{b})}(x,y|q)\). We have then applied each of these two homogeneous q-difference operators in order to derive generating functions, Rogers type formulas, the extended Rogers type formulas, and the Srivastava–Agarwal type linear and bilinear generating functions for each of these families of the generalized Al-Salam–Carlitz q-polynomials.
The various results, which we have presented in this paper, together with the citations of many related earlier works are believed to motivate and encourage interesting further research on the topics of study here.
In conclusion, it should be remarked that in a recently-published survey-cum-expository article Srivastava [31] presented an expository overview of the classical q-analysis versus the so-called \((p,q)\)-analysis with an obviously redundant additional parameter p (see, for details, [31, p. 340]).
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Srivastava, H.M., Arjika, S. Generating functions for some families of the generalized Al-Salam–Carlitz q-polynomials. Adv Differ Equ 2020, 498 (2020). https://doi.org/10.1186/s13662-020-02963-9
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DOI: https://doi.org/10.1186/s13662-020-02963-9
MSC
- 05A30
- 33D15
- 33D45
- 05A40
- 11B65
Keywords
- Basic (or q-) hypergeometric series
- Homogeneous q-difference operator
- q-Binomial theorem
- Cauchy polynomials
- Al-Salam–Carlitz q-polynomials
- Rogers type formulas
- Extended Rogers type formulas
- Srivastava–Agarwal type generating functions