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Bernoulli polynomials
In mathematics, the Bernoulli polynomials occur in the study of many special functions and in particular the Riemann zeta function and the Hurwitz zeta function. This is in large part because they are an Appell sequence, i.e. a Sheffer sequence for the ordinary derivative operator. Unlike orthogonal polynomials, the Bernoulli polynomials are remarkable in that the number of crossings of the ''x''-axis in the unit interval does not go up as the degree of the polynomials goes up. In the limit of large degree, the Bernoulli polynomials, appropriately scaled, approach the sine and cosine functions.
This article also discusses the Bernoulli polynomials and the related Euler polynomials, and the Bernoulli and Euler numbers.
==Representations==
The Bernoulli polynomials ''B''''n'' admit a variety of different representations. Which among them should be taken to be the definition may depend on one's purposes.
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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