Namespaces
Variants
Actions

Difference between revisions of "Fejér polynomial"

From Encyclopedia of Mathematics
Jump to: navigation, search
(Importing text file)
 
(TeX)
 
(3 intermediate revisions by one other user not shown)
Line 1: Line 1:
 +
{{TEX|done}}
 
A trigonometric polynomial of the form
 
A trigonometric polynomial of the form
  
<table class="eq" style="width:100%;"> <tr><td valign="top" style="width:94%;text-align:center;"><img align="absmiddle" border="0" src="https://www.encyclopediaofmath.org/legacyimages/f/f038/f038340/f0383401.png" /></td> </tr></table>
+
$$\sum_{k=1}^n\frac1k(\cos(2n+k)x-\cos(2n-k)x),$$
  
 
or a similar polynomial in sines. Fejér polynomials are used in constructing continuous functions for which their Fourier series have given singularities.
 
or a similar polynomial in sines. Fejér polynomials are used in constructing continuous functions for which their Fourier series have given singularities.
  
 
====References====
 
====References====
<table><TR><TD valign="top">[1]</TD> <TD valign="top"> N.K. [N.K. Bari] Bary,   "A treatise on trigonometric series" , Pergamon (1964) (Translated from Russian)</TD></TR></table>
+
<table><TR><TD valign="top">[1]</TD> <TD valign="top"> N.K. [N.K. Bari] Bary, "A treatise on trigonometric series" , Pergamon (1964) (Translated from Russian) {{MR|0171116}} {{ZBL|0129.28002}} </TD></TR></table>

Latest revision as of 15:11, 23 April 2014

A trigonometric polynomial of the form

$$\sum_{k=1}^n\frac1k(\cos(2n+k)x-\cos(2n-k)x),$$

or a similar polynomial in sines. Fejér polynomials are used in constructing continuous functions for which their Fourier series have given singularities.

References

[1] N.K. [N.K. Bari] Bary, "A treatise on trigonometric series" , Pergamon (1964) (Translated from Russian) MR0171116 Zbl 0129.28002
How to Cite This Entry:
Fejér polynomial. Encyclopedia of Mathematics. URL: http://encyclopediaofmath.org/index.php?title=Fej%C3%A9r_polynomial&oldid=13488
This article was adapted from an original article by S.A. Telyakovskii (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article