New type of degenerate Daehee polynomials of the second kind

*Correspondence: s.sharma@mu.edu.sa 1Department of Information System, College of Computer and Information Sciences, Majmaah University, Majmaah 11952, Saudi Arabia Full list of author information is available at the end of the article Abstract Recently, Kim and Kim (Russ. J. Math. Phys. 27(2):227–235, 2020) have studied new type degenerate Bernoulli numbers and polynomials by making use of degenerate logarithm. Motivated by (Kim and Kim in Russ. J. Math. Phys. 27(2):227–235, 2020), we consider a special class of polynomials, which we call a new type of degenerate Daehee numbers and polynomials of the second kind. By using their generating function, we derive some new relations including the degenerate Stirling numbers of the first and second kinds. Moreover, we introduce a new type of higher-order degenerate Daehee polynomials of the second kind. We also derive some new identities and properties of this type of polynomials.


Introduction and preliminaries
Special polynomials have their origin in the solutions of differential equations under some conditions. Special polynomials can be described in various ways such as by generating functions, by p-adic integrals, by recurrence relations, by degenerate versions, and so on.
The degenerate versions of some special numbers and polynomials have been studied by many researchers. The notion of degeneracy provides a powerful tool in defining special numbers and polynomials of their degenerate versions. The most important applications of these polynomials are in the theory of finite differences, analytic number theory, and applications in the classical analysis and statistics. Despite the applicability of special functions in classical analysis and statistics, they also arise in communications systems, quantum mechanics, nonlinear wave propagation, electric circuit theory, electromagnetic theory, and so on.
We are now in a position to state some special numbers and polynomials, which will be used in the paper.
Let B (r) n (x) be the generalized Bernoulli polynomials of order r given by the following generating function (see [1,6,12]): In the case where x = 0, B (r) n =: B (r) n (0) are called the generalized Bernoulli numbers of order r.
The notion of degenerate of the exponential function is considered without the limit case. That is, the degenerate of the exponential function e z is equal to (1 + λz) 1 λ . It follows that the degenerate of the parameter z is log(1+λz) λ . This idea was first considered for Bernoulli polynomials by Carlitz [1] as follows: At the point x = 0 in (2), β n,λ =: β n,λ (0) are called the degenerate Bernoulli numbers.
Let (x) n be the falling factorial sequence given by with the assumption (x) 0 := 1.
As is well known, the degenerate Bernoulli polynomials of higher order were considered by Carlitz [1] as follows: Obviously, which represents the Bernoulli polynomials of higher order. For λ ∈ R, Kim and Kim [8] defined the degenerate version of the logarithm function, denoted by log λ (1 + t), as follows: which is the inverse of the degenerate version of the exponential function e λ (t) as e λ log λ (t) = log λ e λ (t) = t.
The degenerate Stirling numbers of the second kind (see [9]) are defined by Note that which stands for the Stirling numbers of the first kind given by (see [20]) The degenerate Stirling numbers of the second kind (see [16,19]) are given by It is clear that which are called the Stirling numbers of the second kind given by means of the following generating function: [25]).
Roman [24] defined the Bernoulli polynomials of the second kind given by the generating function It is worth noting that (cf. [9]) The degenerate version of Eq. (9) is given by Kim and Kim [14] as follows: satisfying The Daehee polynomials are defined by In the case where x = 0 in (11), D n =: D n (0) are called the Daehee numbers (see [2-4, 8, 13, 14, 17, 18, 20, 22, 23, 25]). Very recently, Kim et al. [17] introduced a new class of degenerate Daehee polynomials via the following generating function: Putting x = 0 in (12) yields d n =: d n (0), the degenerate Daehee numbers. By (2) and (12) we get By comparing the coefficients on both sides of (13) we have the following summation formula for the products S 2,λ (n, m) and d m,λ (x): In 2017, Kim and Kim [9] considered the degenerate Daehee polynomials of the second kind defined by When x = 0 in (15), D n,λ = D n,λ (0) stand for the degenerate Daehee numbers of the second kind. Motivated by the works of Kim and Kim [8,17], we first define a new type of degenerate Daehee numbers and polynomials of the second kind. We investigate some new properties of these numbers and polynomials and derive some new identities and relations between the new type of degenerate Daehee numbers and polynomials of the second kind and Carlitz's degenerate Bernoulli polynomials.

New type degenerate Daehee polynomials of the second kind
In this section, we begin with the following definition.

Definition 2.1
Let λ be a real number. The new type degenerate Daehee polynomials of the second kind are given by means of the following generating function: In the case where x = 0, D n,λ =: D n,λ (0) are called the new type degenerate Daehee polynomials of the second kind.
It follows from (16)  Proof By using (2) and (16) we get Therefore by (17) and (18) we complete the proof. Proof Recall from (16) By the binomial theorem By comparing the coefficients of the same powers of t n of (19) and (20), we arrive at the desired result. Proof By changing t to e λ (t) -1 in (16) In addition to expression (21), we have Equating (21) and (22) proves the theorem.

Theorem 2.4 The new type degenerate Daehee numbers of the second kind are computed by the recurrence relation
By comparing the coefficients at t n n! we complete the proof.
We now state the distribution formula. Proof Using (16), we have where d ∈ N and n ≥ 0. By (25) and (26) we arrive at the desired result.

Theorem 2.6
For n ∈ N, m ≥ 0, we have Proof We first consider the following expression: Now we proceed (27) with different perspective as follows: By comparing the coefficients at t n n! of (27) and (29) we complete the proof.
We now consider a new type of higher-order degenerate Daehee polynomials of the second kind.

Definition 2.2
Let r be a positive integer. New type higher-order degenerate Daehee polynomials of the second kind are defined by the following generating function: When x = 0, D (r) n,λ =: D (r) n,λ (0) are called new type higher-order degenerate Daehee polynomials of the second kind.
It is worth noting that representing the Daehee polynomials of higher order.

Theorem 2.7 Let n be a nonnegative integer. Then we have the following summation formula:
Proof Using (30), we have where we have used the following series manipulation: Since (32) = (33), we arrive at the desired result.

Theorem 2.8
Let n be a natural number. Then the inversion formula of (31) is given by the following relation: Proof By replacing t by e λ (t) -1 in (30) we get On the other hand, we see that Matching (34) and (35) proves the theorem.

Theorem 2.9
Let the variables r and k be natural numbers with r > k. Then we have the following summation formula: we have Equating (36) and (37) proves the theorem.
It is well known from [17] that where B (α) n,λ (x) are called λ-analogue higher-order Bernoulli polynomials, which are given by the generating function Theorem 2.10 Let n be a natural number. Then we have the following explicit summation formula: Proof Changing the parameter t to log λ (1 + t) and x to x λ + 1 in (38) gives Matching the coefficients at t n n! in Eqs. (40) and (41), we obtain This completes the proof of the theorem.
In the case where x = 0 in Theorem 2.10, we have been intensively studying degenerate versions of new special functions, polynomials, and numbers. In this paper, motivated by the works of Kim and his research team, we have studied new type degenerate versions of Daehee numbers and polynomials of the second kind. In this paper, we have derived their explicit, closed, and summation formulae using their generating functions, series manipulation, and analytical means. It seems that these types of polynomials will be continued to be studied due to their interesting reflections in the fields of mathematics, statistics, and sciences.