Cumulants and convolutions via Abel polynomials

Authors:
E. Di Nardo;P. Petrullo;D. Senato
Affiliations:
Dipartimento di Matematica e Informatica, Universití degli Studi della Basilicata, via dell'Ateneo Lucano 10, 85100 Potenza, Italy;Dipartimento di Matematica e Informatica, Universití degli Studi della Basilicata, via dell'Ateneo Lucano 10, 85100 Potenza, Italy;Dipartimento di Matematica e Informatica, Universití degli Studi della Basilicata, via dell'Ateneo Lucano 10, 85100 Potenza, Italy
Venue:
European Journal of Combinatorics
Year:
2010

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Abstract

We provide a unifying polynomial expression giving moments in terms of cumulants, and vice versa, holding in the classical, boolean and free setting. This is done by using a symbolic treatment of Abel polynomials. As a by-product, we show that in the free cumulant theory the volume polynomial of Pitman and Stanley plays the role of the complete Bell exponential polynomial in the classical theory. Moreover, via generalized Abel polynomials we construct a new class of cumulants, including the classical, boolean and free ones, and the convolutions linearized by them. Finally, via an umbral Fourier transform, we state an explicit connection between boolean and free convolution.