## Banach Journal of Mathematical Analysis

### A special Gaussian rule for trigonometric polynomials

#### Abstract

Abram Haimovich Turetzkii [Uchenye Zapiski, 1 (149) (1959), 31-55 (translation in English in East J. Approx. 11 (2005), 337-359)] considered interpolatory quadrature rules which have the following form $\int_0^{2\pi}f(x)w(x)d x\approx \sum_{\nu=0}^{2n}w_\nu f(x_\nu)$, and which are exact for all trigonometric polynomials of degree less than or equal to $n$. Maximal trigonometric degree of exactness of such quadratures is $2n$, and such kind of quadratures are known as quadratures of Gaussian type or Gaussian quadratures for trigonometric polynomials. In this paper we prove some interesting properties of a special Gaussian quadrature with respect to the weight function $w_m(x)=1+\sin mx$, where $m$ is a positive integer.

#### Article information

Source
Banach J. Math. Anal., Volume 1, Number 1 (2007), 85-90.

Dates
First available in Project Euclid: 21 April 2009

https://projecteuclid.org/euclid.bjma/1240321558

Digital Object Identifier
doi:10.15352/bjma/1240321558

Mathematical Reviews number (MathSciNet)
MR2350197

Zentralblatt MATH identifier
1140.65096

Subjects
Primary: 65D30: Numerical integration
Secondary: 42A05: Trigonometric polynomials, inequalities, extremal problems

#### Citation

Milovanovic, Gradimir V.; Cvetkovic, Aleksandar S.; Stanic, Marija P. A special Gaussian rule for trigonometric polynomials. Banach J. Math. Anal. 1 (2007), no. 1, 85--90. doi:10.15352/bjma/1240321558. https://projecteuclid.org/euclid.bjma/1240321558

#### References

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• A.H. Turetzkii, On quadrature formulae that are exact for trigonometric polynomials, East J. Approx. 11 (2005), 337–359 (translation in English from Uchenye Zapiski, Vypusk 1 (149), Seria math. Theory of Functions, Collection of papers, Izdatel'stvo Belgosuniversiteta imeni V.I. Lenina, Minsk (1959), 31–54).