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Ward’s Generalized Special Functions

Anthony G. Shannon*, Ömür Deveci

Emeritus Professor, University of Technology Sydney, NSW 2007, Australia, Fellow, Warrane College, University of New South Wales, Kensington NSW 2033

Abstract: This paper considers generalizations of Bernoulli and Euler numbers to clarify and extend some known relations studied by Morgan Ward. It does this with the Euler-Maclaurin sum formula. It relates the mappings to category theory as a means of applying the ideas further.

Keywords: Special function, Bernoulli polynomial, Euler function, difference operator, normal sequence, divisibility sequence, difference operator, generalized integer, Fermatian numbers, Euler-Maclaurin sum-formula, commutative diagram, category

Received January 03, 2018; Revised February 26, 2018; Accepted June 16, 2018

Citation: Anthony G. Shannon, Ömür Deveci, Ward’s Generalized Special Functions. Turkish Journal of Analysis and Number Theory, 6 (3). 90-92. January 2018. doi:10.12691/tjant-6-3-4

1. Introduction

We explore here some formal aspects of generalized Bernoulli numbers in terms of normal divisibility sequences as defined by Morgan Ward [1,2]. The generalized Bernoulli polynomials in question have the formsuch that

[picture] | (1)

in which

[picture] | (2)

is an analogous Euler function and is a sequence which is normal in that and divisible in that whenever . We shall also require that and

a generalized Bernoulli number. Ward’s generalized coefficients were actually rediscoveries of work by Fontené [3].

2. Associated Operators

We use the operator , and forward difference operator

[picture] | (3)

Formally,

so that

and so that on equating coefficients of t, we get the rather neat result that extends Ward [4]

[picture] | (4)

3. Generalized Bernoulli Numbers

As with ordinary Bernoulli numbers we set and define

[picture] | (5)

where

is a Fontené-Ward binomial coefficient for which Henry Gould [3] obtained some elegant results. (For other approaches to generalized integers see Graeme Cohen [5].) The generalization used here consists essentially in systematically replacing the ordinary binomial coefficient with a binomial coefficient to the base u. Thus, when {un} = Z, the set of integers, the two binomial coefficients are formally identical. We shall refer briefly to the mappings in Section 5. When , the set of Fermatian numbers [6] defined by

where q may be indeterminate with , we get

the well-known q-binomial coefficient [7]. Note that is described as the nth Fermatian of index q [8]. More particularly, when {un} is the sequence of Fibonacci numbers we have the Fibonacci binomial coefficients [9]. Ward has defined a sequence to be normal when

So

and

so that

But

and so

[picture] | (6)

Since when {un} = Z, these reduce to the ordinary Bernoulli numbers [10].

4. Euler-Maclaurin Formula

The importance of the ordinary Bernoulli numbers comes primarily from the Euler-Maclaurin sum-formula for . A generalization of this is

[picture] | (7)

the proof of which follows:

and the coefficients of are  since

Thus

and the coefficients of xk⁺¹ are as required in equation (7).

Hence, these generalized Bernoulli numbersand the ordinary Bernoulli numbersare actually related by

[picture] | (8)

The Euler-Maclaurin formula is also of interest within the context of this paper because it is used in the classic proof of the Staudt-Clausen Theorem by Richard Rado [10,11] and its extensions [12,13].

5. Concluding Comments

Further related research can be carried out with applications of the q-umbral calculus [14] or with category theory. For an example of the latter, let u be the sequence function so that ; let h represent the highest common factor function and then we have The divisibility sequences mentioned in this paper can then be represented in terms of a commutative diagram:

For example,

Now a commutative diagram of four sets and functions with such a composition of functions determines a concrete category. It would be of interest to seek a natural transformation of functions between this and other categories either to generalize or to clarify the structure of the number theoretic results. The theory of categories has been applied to the problem in psychology of abstraction from the senses to the intellect through perception [15] by one of the present writers with Anthony Allen.

Gratitude is expressed to an anonymous referee for several corrections to the original manuscript.

References

[1]   | Ward, Morgan, “Divisibility sequences,” Bulletin of the American Mathematical Society, 42, 843-8455, 1936.
[2]   | Ward, Morgan, “Memoir on elliptic divisibility sequences,” American Journal of Mathematics, 70 (1), 31-74, 1948.
[3]   | Gould, H.W., “The bracket-function and Fontené-Ward generalized binomial coefficients with applications to fibonomial coefficients,” The Fibonacci Quarterly, 7 (1), 23-40, 55, 1969.
[4]   | Ward, Morgan. “A calculus of sequences,” American Journal of Mathematics, 58, 255-266, 1936.
[5]   | Cohen, G.L., “Selberg formulae for Gaussian integers,” Acta Arithmetica, 16, 385-400, 1975.
[6]   | Dickson, L.E. History of the Theory of Numbers, Volume 1. New York, Chelsea, Ch.XVI, 1952.
[7]   | Carlitz, L. and Riordan, J., “Two element lattice permutation numbers and their q-generalization,” Duke Mathematical Journal, 31, 371-388, 1964.
[8]   | Shannon, A.G., “Some Fermatian Special Functions,” Notes on Number Theory and Discrete Mathematics, 9 (4), 73-82, 2003.
[9]   | Hoggatt, Verner E. Jr., “Fibonacci numbers and generalized binomial coefficients,” The Fibonacci Quarterly, 5, 383-400, 1967.
[10]   | Rado, R., “A new proof of a theorem of v. Staudt,” Journal of the London Mathematical Society, 9 (1), 85-88, 1934.
[11]   | Rado, R., “A note on the Bernoullian numbers,” Journal of the London Mathematical Society, 9 (1), 88-90, 1934.
[12]   | Carlitz, L., “The Staudt-Clausen theorem,” Mathematics Magazine, 35, 131-146, 1961.
[13]   | Horadam, A.F. and Shannon, A.G.,“Ward’s Staudt-Clausen problem,” Mathematica Scandinavica, 29 (4), 239-250, 1976.
[14]   | Roman, Steven, The Umbral Calculus, Orlando, FL: Academic Press, Ch.6, 1984.
[15]   | Allen, A.L. and Shannon, A.G., “Note on a category model for an abstraction mechanism.” Psychological Reports. 27: 591-594, 1970.