Abstract
In this paper, we present a probabilistic extension of the Fubini polynomials and numbers associated with a random variable satisfying some appropriate moment conditions. We obtain the exponential generating function and an integral representation for it. The higher order Fubini polynomials and recurrence relations are also derived. A probabilistic generalization of a series transformation formula and some interesting examples are discussed. A connection between the probabilistic Fubini polynomials and Bernoulli, Poisson, and geometric random variables are also established. Finally, a determinant expression formula is presented.
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1 Introduction
Recently, certain polynomials and numbers have received growing attention in many branches of mathematics, computer science, and physics. More specifically, the study on the Stirling numbers of the second kind has progressed significantly during the past few decades. The Stirling numbers of the second kind, denoted by S(n, k), count the total number of partitions of a set of n elements into k non-empty disjoint subsets and play an important role in combinatorics. It is defined by (see [34])
Its exponential generating function is given by (see [34, Chapter 9])
where \({\mathbb {C}}\) is the set of complex numbers. For more details on the Stirling numbers of the second kind and its properties, one may refer to Comtet [10] and Gould [34].
A number of polynomials are defined through S(n, k). For instance, the Bell polynomials \(B_n(x)\) are defined as (see [16] and [21])
An alternate expression for \(B_n(x)\) is
which is the nth order moment of the Poisson variable Y(x) with mean \(x>0\). Here \({\mathbb {E}}\) denotes the mathematical expectation.
Besides the Bell polynomials, the Fubini polynomials are also applied in various disciplines of the applied sciences and combinatorics. These polynomials are also known as the geometric polynomials or the ordered Bell polynomials. Through the Stirling numbers of the second kind, Fubini polynomials are defined by the relation (see [2, 9, 33, 38])
The exponential generating function of \(W_n(x) \) is
Note that, when \(x=1\), (1.4) yields
which are called Fubini numbers (see [6, 8]) and satisfy the recurrence relation (see [13])
Recently, Adell and Lekuona [5] defined a probabilistic version of the Stirling numbers of the second kind. Let Y be a real valued random variable (rv) having finite moment generating function (mgf) and \(\{ Y_j \}_{j \ge 0}\) be a sequence of independent and identically distributed (i.i.d.) random variables (rvs) with distribution as that of the rv Y. Define \(S_0 =0\) and \(S_j = Y_1 +Y_2 + \cdots + Y_j, ~j \ge 1.\) The probabilistic Stirling numbers of the second kind \(S_Y(n,k)\), associated with the rv Y, is defined via the relation
Its exponential generating function is (see [1] and [5])
When Y is degenerate at 1, (1.8) and (1.9) reduce to (1.1) and (1.2), respectively. They obtained the moments of \(S_j\) as (see [1])
where \(n \wedge j = \min \{n,j\}\) and \((j)_k = j(j-1)\cdots (j-k+1)\) is the falling factorial.
Soni et al. [36] discussed the probabilistic Bell polynomials defined by
which has the exponential generating function
An alternative representation of \(B_n^Y(x)\) in terms of the Poisson moments is given by
When Y is degenerate at 1, it coincides with (1.3), the famous Dobiński’s formula.
Kim [25] established a connection between the geometric rv and the Fubini polynomials. For \(p \in (0,1]\), let \(G_p\) be a geometric rv with probability mass function (pmf) \(P\{G_p=i\}=p(1-p)^{i-1},\;i \ge 1.\) Note that \(G_p\) denotes the number of trials needed for the first success, when a coin with success probability p is tossed. It follows easily as
For \(x\ge 0\), let \(\eta (x)=(1+x)^{-1}.\) Then the connection between the geometric rv \(G_{\eta (x)}\) and the Fubini polynomials is
As mentioned earlier, a probabilistic representation of the Stirling numbers of the second kind in terms of i.i.d. rvs is studied by Adell [1] and Adell and Lekuona [5]. These results are very useful in the analytical number theory and in generalizing different classical sums of powers of arithmetic progression formulas. Laskin [28] studied a fractional generalization of the Bell polynomials and the Stirling numbers of the second kind. Guo and Zhu [14] introduced the generalized Fubini polynomials and studied their logarithmic properties. Recently, Kim and Kim [19] defined the probabilistic degenerate Bell polynomials associated with random variables. A probabilistic degenerate extension of the Stirling numbers of the second kind is discussed in [20, 23]. The degenerate Dowling polynomials and their connection to Poisson degenerate central moments were also covered by Kim and Kim [18] and Kim et al. [22]. Motivated by the work of Adell and Lekuona [5] and Guo and Zhu [14], we consider a probabilistic generalization of the Fubini polynomials and numbers and explore their important properties. The connections of these polynomials with the known families of the probability distributions are explored. A simple determinant formula for the probabilistic Fubini numbers is also derived along with some combinatorial sums.
The paper is organized as follows. In Sect. 2, we present a probabilistic extension of the Fubini polynomials and numbers. The exponential generating function, integral representation, and some recurrence relations are obtained. A connection between the higher order probabilistic Fubini polynomials and the negative binomial process is also discussed. In Sect. 3, we obtain a probabilistic generalization of a series transformation formula and illustrate it with some examples. A new relationship between the rising factorial and the Lah numbers is deduced. A connection of the probabilistic Fubini polynomials with Bernoulli, Poisson, and geometric random variates are discussed in Sect. 4. Finally, a determinant expression for the probabilistic Fubini numbers and a combinatorial sum formula is also obtained in Sect. 5.
2 Probabilistic Fubini Polynomials and Numbers
Let \({\mathcal {G}}\) be the set of rvs Y satisfying the following moment conditions
where \({\mathbb {N}}_0 = {\mathbb {N}} \cup \{0\}\), \(r > 0,\) \({\mathbb {N}}\) is the set of natural numbers and \({\mathbb {E}}\) denotes the mathematical expectation. The condition in (2.1) confirms the existence of the moment generating function for rv Y (see [7, p. 344]).
Let \(\{ Y_i\}_{i \ge 0}\) be i.i.d. copies of a rv \(Y \in {\mathcal {G}}.\) By Jensen’s inequality, we have
where \(S_i = Y_1 + Y_2 + \cdots + Y_i\) and \(S_0 =0\).
In view of (1.15), we define the probabilistic Fubini polynomials associated with the rv Y as
where \(G_p\) follows the geometric distribution with parameter p and \(\eta (x)=(1+x)^{-1}.\) In case of the degeneracy of the rv Y at 1, (2.2) leads to the classical Fubini polynomials. In particular, when \(Y=1\) and \(x=1\) in (2.2), we get the nth order moments of the geometric rvs with probability of success equals 1/2. These moments are well-known as the Fubini numbers.
Next, we present the exponential generating function for the probabilistic Fubini polynomials.
Proposition 2.1
Let \(|x\left( {\mathbb {E}}e^{tY}-1\right) | \le 1\). Then,
Proof
For the i.i.d. copies of the rv Y, we have, from (2.2),
Hence, the proposition is proved. \(\square \)
The series expansion of (2.3) in the light of (1.9) gives an alternative representation of the probabilistic Fubini polynomials in terms of the probabilistic Stirling numbers of the second kind of the following form
It may be observed that for \(x=1\), (2.4) gives a probabilistic generalization of the classical Fubini numbers given by
We call it the probabilistic Fubini numbers.
When Y follows an exponential distribution with mean 1, we establish a connection between the probabilistic Fubini polynomials and the Lah numbers of the following form
In the literature, (2.6) is termed as 0-Fubini-Lah polynomials (see [35]).
In the following proposition, we give an integral representation for the probabilistic Fubini polynomials.
Proposition 2.2
Let \(Y \in {\mathcal {G}}\). Then
where V is the standard exponential rv with probability density function \(f(v) = e^{-v}, v\ge 0\) and \({\mathbb {E}}_V\) stands for the mathematical expectation for rv V.
Proof
Considering (2.4) and with the help of the gamma integral, we have
where \(k! = \int _{0}^{\infty } v^k e^{-v}dv\). \(\square \)
For n and k be two non-negative integers such that \(n \ge k,\) the partial exponential Bell polynomials \(B_{n,k}(x_1,x_2,\dots , x_{n-k+1})\) have the following form (see [10])
where the summation is taken over the following set
A connection between the probabilistic Stirling numbers of the second kind and the partial exponential Bell polynomials is obtained and is given by (see [36])
When \(x=1\), and using (2.8) and Proposition 2.2, we get
where \(B_{n}\) are the complete exponential Bell polynomials which can be expressed in terms of the partial exponential Bell polynomials as (see [10, p. 133])
It is well-known that geometric distribution is a special case of the negative binomial distribution. For \(\alpha > 0\) and \(0< p < 1\), let \(Z_p^\alpha \) follows negative binomial distribution denoted by NB\((\alpha , p)\) with pmf
When \( p =\eta (x)= 1/(1+x)\), the mgf of \(Z_{\eta (x)}^\alpha \) is given by
provided \(t < \log \left( 1+1/x\right) \).
We define the \(\alpha \)-th order probabilistic Fubini polynomials as
It has following exponential generating function
Using the series expansion formula \(\frac{1}{(1-x)^\alpha } = \sum _{i = 0}^{\infty } \left( {\begin{array}{c}-\alpha \\ i\end{array}}\right) (-x)^i\), the exponential generating function (2.9) is simplified as
On comparing with (2.9), we get
which can be viewed as an alternate representation for the \(\alpha \)th order probabilistic Fubini polynomials. We also obtain some identities and interconnections of \(\alpha \)th order probabilistic Fubini polynomials in the subsequent sections.
Next, we obtain some recurrence relations for the probabilistic Fubini polynomials and also discuss their special cases.
Proposition 2.3
Let \(W_n^{Y}(x)\) be the probabilistic Fubini polynomials. Then, we have
Proof
Using (2.3), we get
Comparing the coefficients of \(t^n\) on both sides, we get required result. \(\square \)
With the help of the Proposition 2.3, one can deduce recurrence relation for the probabilistic Fubini numbers. In particular, when \(Y=1\), it reduces to (1.7).
Theorem 2.1
Let \(Y \in {\mathcal {G}}\). Then, for \(n \ge k \ge i\), we have
Proof
Differentiating (2.3) with respect to t on both sides, we get
Equating the coefficients of \(t^n\), we get the result. \(\square \)
Next, the following proposition is a recurrence relation in terms of derivative for the probabilistic Fubini polynomials.
Theorem 2.2
For \(Y \in {\mathcal {G}}\), we have
Proof
Differentiating (2.3) with respect to x, we get
Making series expansion of \(1/\left( 1-x\left( {\mathbb {E}}e^{tY}-1\right) \right) ^2\) and with the help of Theorem 2.1, we get
On comparing the coefficients of \(t^n\) on both sides, the result in (2.12) follows. \(\square \)
3 Probabilistic Generalization of a Series Transformation Formula
Spivey [37] recently unveiled a new approach to evaluate combinatorial sums formula using a finite difference technique. These combinatorial sums can be obtained in terms of the Stirling numbers of the second kind. Adell and Lekuona [3] and Adell [5], studied the applications of the probabilistic Stirling numbers of the second kind and obtained the probabilistic extension of some known combinatorial identities. Boyadzhiev [8] considered a series transformation formula with numerous examples. Let f(x) and g(x) be two arbitrary functions such that f(x) is entire and g(x) is analytic on \( D = \{x: r<|x|<R\}\) with \( 0 \le r < R\). Then, f(x) and g(x) can be written as
where \(f_n\) and \(g_n\) denote the nth coefficient of series for the functions f and g, respectively.
Motivated by Boyadzhiev [8] work, we present, in the next result, a probabilistic generalization of the series transformation formula. An important feature of this generalization is that for an appropriate choice of the functions f and g, and for a suitable rv Y in the class \({\mathcal {G}}\), several well-known series sums formulas can be obtained in the closed forms involving some known classical polynomials and probability distribution functions.
Theorem 3.1
For \(Y \in {\mathcal {G}}\), we have
where \(S_i\) is sum of i.i.d. copies of the rv \(Y \in {\mathcal {G}}.\)
Proof
Using (1.10), we get
On multiplying both sides with \( {f^{(n)}(0)}/{n!}\) and summing over n from 0 to \(\infty \), we get the result. \(\square \)
Remark 3.1
When Y is degenerate at 1, (3.2) reduces to the following series transformation formula (see [8, Eq. 4.11])
Example 3.1
For \(g(x)=e^x\) in (3.2), we get a new identity which is given by
On rearrangement of terms in (3.4), we obtain a connection of the probabilistic Bell polynomials with Poisson rv of the form
where Y(x) follows Poisson distribution with parameter x.
Moreover, for \(f(x)=x^n\), (3.5) leads to the probabilistic Bell polynomials defined in (1.13).
Corollary 3.1
If f(x) be the polynomial of degree n, then
where \(B_n(x)\) are the Bell polynomials.
Proof of the corollary can be executed by the idea of (3.5) and Theorem 9.2 of [34].
Example 3.2
For \(g(x) = \frac{1}{1-x}\) with \(|x| < 1\) and \(f(x) = x^n\), from (3.2) we get
where \(n \wedge k= \min \{n,k\}\). This is a probabilistic generalization of the following identity studied in [8].
It may be observed that for \(x=\frac{1}{2}\), (3.6) gives
which is a probabilistic extension of the Fubini numbers.
Also, when Y follows a standard exponential distribution, we have a new connection between nth sum of rising factorial and the Lah numbers, which is given as
where \(\langle i \rangle _n = i (i+1)\cdots (i+n-1)\) denotes the rising factorials.
Example 3.3
For \(g(x)= \frac{1}{(1-x)^r}\) with \({\text {Re}}(r) >0\) and \(|x| < 1,\) (3.2) yields
Alternatively, (3.8) may be expressed as
where \(W_{n}^{Y} \left( \frac{x}{1-x}; r\right) \) are the rth order probabilistic Fubini polynomials coincide with (2.10).
For a particular choice \(f(x)=x^n\), from (3.8), we have
This is a probabilistic extension of the formula (3.28) studied in [8].
Now, in the following propositions, we prove some interesting identities for the probabilistic Fubini polynomials.
Proposition 3.1
For \(k \in {\mathbb {N}}_0\), we have
provided \(D_{t}^k \left( \displaystyle \frac{1}{1-x{\mathbb {E}}e^{tY}}\right) \) exists for \(Y \in {\mathcal {G}},\) where \(D_{t}^k\) is kth order differential operator with respect to t.
Proof
We start with left hand side of (3.11) and with the help of (3.6), we get
Using \(D_t^k{\mathbb {E}}e^{tS_n} = {\mathbb {E}}S_n^ke^{tS_n},\) we get
Hence, the identity is proved. \(\square \)
Remark 3.2
The Proposition 3.1 may be viewed as a probabilistic extension to the identity proved in [30].
Proposition 3.2
For \(k \in {\mathbb {N}}\), we have
provided \(D_y^i\left( {\mathbb {E}}e^{yY}\right) ^j\) exists for \(Y \in {\mathcal {G}}.\)
Proof
Using (3.6), we get
With the help of (1.11), we get the proposition. \(\square \)
4 Probabilistic Fubini Polynomials and Some Probability Distributions
For different choices of probability distribution of the rv Y, we obtain the different representations of the probabilistic Fubini polynomials and the numbers. These representations may be in terms of the Stirling numbers of the second kind, polylogarithm functions, and the Apostol-Euler polynomials. Some special choices of the rvs \(Y \in {\mathcal {G}}\), we have the following examples.
Example 4.1
Let Y be a Poisson random variate with pmf and the mgf, \({\mathbb {P}}\{Y = k\} = e^{-\lambda }\frac{\lambda ^k}{k!},\) and \({\mathbb {E}}\left( e^{tY}\right) = e^{\lambda (e^t -1)},\;\lambda >0\), respectively.
Substituting the mgf into (2.3) and using (1.2), we obtain
Finally, comparing the coefficients of powers of t, we get a convolution result of the form
Let \(Y_1, Y_2, \dots , Y_i\) be i.i.d. copies of Poisson rv with mean \(\lambda \). Then, \(S_i = Y_1 + Y_2 +\cdots + Y_i\sim \text {Poisson}(i\lambda )\) for \(i = 1,2,\dots \). Using (1.3) and (3.6), we obtain a relationship between the Bell polynomials and the probabilistic Fubini polynomials as
Example 4.2
Let Y be a geometric rv different from \(G_p\) with the pmf
where \(s =1-r,\;\;0<r\le 1.\)
One can verify the following interconnection between the polylogarithms and the geometric variate
where \({\text {Li}}_z(y) = \sum _{i = 1}^{\infty } \frac{y^j}{i^z}\) with \(y,z \in {\mathbb {C}}\) and \(|y| <1\).
We define the kth multinomial convolution of the polylogarithm function as
with \({\text {Li}}_0^{*0}(s) = 1\).
Let \(\langle Y_i \rangle _ {i\ge 0}\) be the sequence of independent copies of the geometric rv Y. Then, we obtain
Theorem 4.1
Let Y be the geometric rv as considered in Example 4.2. Then
where \(G_p\) is geometric variate with parameter \(p =\eta (x)= 1/(1+x)\) as defined in (1.14).
Also, for \(p = (1+x)/(1+2x),\) we have
provided above limits exist.
Proof
On multiplying with \(pq^k\) both sides of (4.1) and using (1.14), we get
where \(q=1-\eta (x)\). For \(p = \eta (x),\) the right hand side quantity of (4.4) converges to the nth order moment of geometric rv provided the limit exists. Hence, using (2.2), we get the desired result. The result (4.3) is the consequence of identity (3.6) with the help of (4.2). \(\square \)
In the following example, we derive a relationship between probabilistic Fubini polynomials and the generalized Apostol-Euler polynomials in the framework of the Bernoulli rv.
Example 4.3
Let Y be a Bernoulli rv with \({\mathbb {E}}(e^{tY})-1 = p(e^t-1),\;0<p\le 1\) (see [24]). Clearly, from (2.3), we get
Ding and Yang [11] recently employed the generating function method to obtain numerous symmetric identities involving the Apostol-Euler polynomials. He [15] used suitable summation transform techniques to further examine several summation formulae of products linked with Apostol-Euler polynomials. Recently, Luo [29] and Kim et al. [17] mentioned the generalized Apostol-Euler polynomials of real order and integer order, respectively and provided related convolution results. Adell and Lekuona [4] examined several applications of the generalized Apostol-Euler polynomials to the results related to Appell polynomials. The Apostol-Euler polynomials \(E_n(c;x)\) are defined by the exponential generating function of the form (for more details see [4, 15, 17], and [32])
where \(t \in {\mathbb {R}}\) and \( c \in {\mathbb {C}}.\)
Consider (4.5) and with the help of (2.3), we get
We establish an interconnection between the Apostol-Euler polynomials and the probabilistic Fubini polynomials by comparing the coefficients of t. It is given by
Remark 4.1
For \(x=0\), (4.6) gives
where \(E_n(\cdot )\) are the Apostol-Euler numbers.
For any \(\alpha \in {\mathbb {R}}\), we have established an interconnection between higher order probabilistic Fubini polynomials and the generalized Apostol-Euler polynomials of the following form
where \(E_n(\alpha ,-cp;x)\) are the generalized Apostol-Euler polynomials defined via the exponential generating function as (see [4])
5 Probabilistic Fubini Numbers and Its Determinant Expressions
Recently, the determinant expressions of several polynomials and numbers are obtained in the literature. Komatsu [27] and Glaisher [12] studied the determinant expressions for the Cauchy polynomials, Bernoulli numbers and the Euler numbers.
The following theorem provides a determinant expression for a sequence of the real numbers.
Theorem 5.1
(Komatsu [26]) Let \(\langle f(n) \rangle _{n \in {\mathbb {N}}}\) be a sequence with \(f(0)=1\) and let w(k) be an arbitrary function independent of n. Then
if and only if
Also, function w(k) is expressed as
The following lemma (see [26, 27, 31]) will be used to obtain the explicit expression for sequence of the probabilistic Fubini numbers.
Lemma 5.1
Let A be a square matrix of order \((k+1)\) defined by
Also, inverse of A is given by
Using Trudi’s formula (see [26, 31]), the combinatorial expression of sequence f(n) is obtained. It has the following combinatorial form
where \(\left( {\begin{array}{c}l_1 + \cdots + l_n\\ l_1,\dots , l_n\end{array}}\right) \) are multinomial coefficients and \(l_i\)’s stand for the numbers of blocks with i elements while partitioning a set with n elements.
In the next result, we obtain a determinant expression to the probabilistic Fubini numbers and present a combinatorial sum formula for the probabilistic Fubini numbers.
Theorem 5.2
For \(n \ge 1\), we have
Moreover, it has a explicit combinatorial expression of the form
Proof
Simplifying the recurrence relation obtained in Proposition 2.3 for \(x=1\), we get
Observe that (5.5) has a similar expression as (5.1) with
Using Theorem 5.1, the required determinant expression (5.3) can be obtained.
From (5.6), we also have
Hence, using Lemma 5.1 and the Trudi’s formula (see [26, 31]), we get the required combinatorial interpretation of the probabilistic Fubini numbers. \(\square \)
For degenerate rv Y at 1, we get the combinatorial interpretation of the Fubini numbers as (see [26])
Example 5.1
Suppose Y follows standard exponential distribution. Then, using (5.3) and (5.6), we get
Also, from (5.4), we have weighted sum of multinomial coefficients as
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The research of R. Soni was supported by CSIR (File No: 09/1051(11349)/2021-EMR-I), Government of India. A. K. Pathak would like to express his gratitude to Science and Engineering Research Board (SERB), India for financial support under the MATRICS research grant MTR/2022/000796.
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Soni, R., Pathak, A.K. & Vellaisamy, P. A Probabilistic Extension of the Fubini Polynomials. Bull. Malays. Math. Sci. Soc. 47, 102 (2024). https://doi.org/10.1007/s40840-024-01702-7
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DOI: https://doi.org/10.1007/s40840-024-01702-7