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Generalized Appell polynomials
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Generalized Appell polynomials : ウィキペディア英語版
Generalized Appell polynomials
In mathematics, a polynomial sequence \ has a generalized Appell representation if the generating function for the polynomials takes on a certain form:
:K(z,w) = A(w)\Psi(zg(w)) = \sum_^\infty p_n(z) w^n

where the generating function or kernel K(z,w) is composed of the series
:A(w)= \sum_^\infty a_n w^n \quad with a_0 \ne 0
and
:\Psi(t)= \sum_^\infty \Psi_n t^n \quad and all \Psi_n \ne 0
and
:g(w)= \sum_^\infty g_n w^n \quad with g_1 \ne 0.
Given the above, it is not hard to show that p_n(z) is a polynomial of degree n.
Boas–Buck polynomials are a slightly more general class of polynomials.
==Special cases==

* The choice of g(w)=w gives the class of Brenke polynomials.
* The choice of \Psi(t)=e^t results in the Sheffer sequence of polynomials, which include the general difference polynomials, such as the Newton polynomials.
* The combined choice of g(w)=w and \Psi(t)=e^t gives the Appell sequence of polynomials.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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