Cumulants and convolutions via Abel polynomials

Details Cumulants and convolutions via Abel polynomials Cumulants and convolutions via Abel polynomials

2010-02-25

arxiv.org/abs/1002.4803v1

Mathematics

Combinatorics

Scientific paper

We provide an unifying polynomial expression giving moments in terms of cumulants, and viceversa, 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 a explicit connection between boolean and free convolution.

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