Some families of differential equations associated with the Gould-Hopper-Frobenius-Genocchi polynomials

The basic objective of this paper is to utilize the factorization technique method to derive several properties such as, shift operators, recurrence relation, differential, integro-differential, partial differential expressions for Gould-Hopper-Frobenius-Genocchi polynomials, which can be utilized to tackle some new issues in different areas of science and innovation.


Introduction
The investigation of factorization technique is seen as the similarity among Maxwell's and Dirac's equations. They are both linear systems of equations and each of them contains partial derivatives of the first order. Also, both Maxwell's and Dirac's equations are Lorentz invariant. It may be remarked that in the case of Maxwell's equations, the linearity may be an over-simplification which leads to the difficulties with infinite self-energies.
An operational procedure which provides answers to the questions about eigenvalue problems and which are of significant importance to physicists is known as the factorization method [10]. The basic idea is to consider a pair of first-order differential equations, which on operating gives an equivalent second-order differential equation. The manufacturing process is also used for the calculation of transition probabilities. The method is generalized so that it will handle perturbation problems.
The sequences of two differential operators η − m and η + m , for m = 0, 1, 2, · · · are defined as: η − m (l m (u)) = l m−1 (u) (1.1) and η + m (l m (u)) = l m+1 (u), (1.2) are called the derivative and multiplicative operators, respectively. A significant property known as the differential equation is obtained on using these above mentioned operators η − m and η + m . The technique used in obtaining differential equations via Eq (1.3) is known as the factorization method. The main idea behind the factorization method is to find the derivative operator η − m and multiplicative operator η + m such that the Eq (1.3) holds.
The iterations of η − m and η + m to l m (u) provide the following relations: We can derive higher order differential equations that are fulfilled by particular special polynomials using the operational relations outlined above. The second-order differential equations were studied using the classical factorization method presented in [10].
The Frobenius-Genocchi polynomials G m (x|u) satisfying the following exponential generating expression were explored in great depth by Yilmaz andÖzarslan [14]: For, x = 0, these Frobenius-Genocchi polynomials G m (x|u) reduce to the Frobenius-Genocchi numbers G m (u). Therefore, G m (u) = G m (0|u) and thus are given by the following expression: It is clear that G 0 (0|u) = G 0 (u) = 0 and G 1 (u) = 1. (1.10) Further more in [14], it is given that the numbers g k (u) related to Frobenius-Genocchi polynomials G m (x|u) are given by and by series manipulations, one can find Also, the Frobenius-Genocchi polynomials G m (x|u) are recursively represented in terms of the Frobenius-Genocchi numbers G m (u) as follows: The classical Genocchi polynomials G m (x) are an analogue of the Frobenius-Genocchi polynomials G m (x|u), represented by the following generating expression: (1.14) Especially, the rational numbers G m = G m (0) are called the classical Genocchi numbers. These numbers and polynomials play essential roles in many different areas of mathematics including number theory, combinatorics, special functions and analysis. Obviously, the Frobenius-Genocchi polynomials G m (x|u) give the classical Genocchi polynomials G m (x) for u = −1 in Eq (1.8).
Gould-Hopper based Frobenius-Genocchi polynomials given in [2], g ( j) G m (x, y|u) are represented by the succeeding generating expression Using (1.9) and generating expression of Gould-Hopper polynomials [8]: in the l.h.s. of (1.15), it follows that using Cauchy product rule and replacing m by m − k in above equation, the following series representation is established: Similarly, using generating expression and expanding the term exp(yt j ) in the l.h.s. of Eq (1.15), we obtain the following series representation for Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u): This hybrid special polynomials family carry the properties of the parent polynomials. These polynomials are important because they possess important properties such as generating function, series definition, recurrence relations, differential equations, summation formulae, integral representations etc. In [9,[11][12][13], the differential equations for the Appell and related families of polynomials are derived by using factorization method [10]. This approach is further extended to derive the differential and integral equations for the hybrid, mixed type and 2D special polynomials related to the Appell family, see for example [1,[3][4][5][6][7]. This provides motivation to establish the differential equations for the Gould-Hopper-Frobenius-Euler polynomials. This gives inspiration to build up the differential equations for the g ( j) G m (x, y|u) polynomials.
The article is organized as follows: In Section 2, the recurrence relation and shift operators for the Gould-Hopper based Frobenius-Genocchi polynomials are derived. In Section 3, the differential, integro-differential and partial differential equations for this family are established.

Recurrence relations and shift operators
For the Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u), the recurrence relation and shift operators are derived in this section.
In order to derive the recurrence relation for the Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u), the following result is proved: Theorem 2.1. For the Gould-Hopper based Frobenius-Genocchi polynomials with two variables g ( j) G m (x, y|u) , the following recurrence relation holds true:

1)
where u is a parameter, j is a positive integer and the numerical coefficients g k (u) are related to G m (x|u) that is Frobenius-Genocchi polynomials given by the relations (1.11) and (1.12).
Proof. Taking derivatives of expression (1.15) with respect t on both sides, it follows that Rearranging and simplifying the terms, we have Replacing m by m+1 in the l.h.s. and using well known Cauchy-product rule in the r.h.s. by replacing m by m-j+1 and m-k in second and third terms, it follows that Using g 0 = 0 and g 1 = 1 2 , the third term in r.h.s. becomes 0 and − m 2(1−u) g ( j) G m−1 (x, y|u) for k = 0 and 1, respectively. To make the term same as g ( j) G m (x, y|u) as in first term, we replace m by m + 1. Therefore, combining it with first term and comparing the coefficients of like powers of t on the both sides of the resultant equation, assertion (2.1) is obtained.
Next, we find the shift operators for the Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u) by proving the following result: Theorem 2.2. For the Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u), the following expressions for the shift operators holds true: where D x := ∂ ∂x , D y := ∂ ∂y , and D −1 Proof. Differentiating generating relation (1.15) with respect to x and then equating the coefficients of same powers of t on both sides of the resultant equation, we have Consequently, it follows that which proves assertion (2.3). Next, differentiating generating relation (1.15) with respect to y and then equating the coefficients of same powers of t on both sides of the resultant equation, we have which in view of Eq (2.8) can be written as Thus assertion (2.4) is proved. Next, to find raising operator x £ + m , the following relation is used: which can be further simplified on using expression (2.9) as: (2.14) Inserting above expression in relation (2.1), we have This yields expression for raising operator (2.5). Further, to obtain the raising operator y £ + m , the following relation is used: simplifying above equation in view of expression (2.12), it follows that Inserting above expression in relation (2.1), it follows that This yields expression for raising operator (2.6).

Differential equations
In this segment utilizing the factorization method, the differential, integro-differential, and partial differential expressions for the Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u) of 2-variables are established.
Theorem 3.1. The Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u) satisfy the following expression for the differential equation: Proof. Using the factorization relation given by and inserting the expressions (2.3) and (2.5) in the l.h.s. of above equation gives assertion (3.1).
Theorem 3.2. The Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u) satisfy the following expressions for the integro-differential equations: and Proof. Consider the following factorization relation: yields assertion (3.4).
Theorem 3.3. The Gould-Hopper based Frobenius-Genocchi polynomials g ( j) G m (x, y|u) satisfy the following expressions for the partial differential equations: and respectively.

Conclusions
Differential equations are used to explain issues in several fields of science and engineering, with special functions serving as solutions in the majority of cases. The differential and integral equations that these hybrid type special polynomials satisfy can be used to address new issues in a variety of fields. To study the combination of operational representations with the factorization method and their applications to the theory of differential equations for other hybrid type special polynomials and for their relatives will be taken in further investigation.