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Vladikavkazskii Matematicheskii Zhurnal, 2023, Volume 25, Number 1, Pages 131–140
DOI: https://doi.org/10.46698/l9013-9196-4430-x
(Mi vmj853)
 

Quadrature formula of the highest algebraic degree of accuracy containing predefined nods

Sh. S. Khubezhtyab

a North Ossetian State University, 44–46 Vatutina St., Vladikavkaz 362025, Russia
b Southern Mathematical Institute VSC RAS, 53 Vatutina St., Vladikavkaz 362025, Russia
References:
Abstract: Approximate methods for calculating definite integrals are relevant to this day. Among them, the quadrature methods are the most popular as they enables one to calculate approximately the integral using a finite number of values of the integrable function. In addition, in many cases, less computational labor is required compared to other methods. Using Chebyshev polynomials of the first, second, third, and fourth kind corresponding to the weight functions $p(x)=\frac{1}{\sqrt{1-x^2}}$, $p(x)=\sqrt{1- x^2}$, $p(x)=\sqrt{\frac{1+x}{1-x}}$, $p(x)=\sqrt{\frac{1-x}{1+x }}$, on the segment $[-1,1]$, quadrature formulas are constructed with predefined nodes $a_1=-1$, $a_2=1$, and estimates of the remainder terms with degrees of accuracy $2n+1$. In this case, a special place is occupied by the construction of orthogonal polynomials with respect to the weight $p(x)(x^2-1)$ and finding their roots. This problem turned out to be laborious and was solved by methods of computational mathematics.
Key words: weight functions, orthogonal polynomials, quadrature formulas, predetermined nodes, remainder terms, degrees of accuracy.
Funding agency Grant number
Ministry of Science and Higher Education of the Russian Federation 075-02-2022-80090
Received: 12.11.2021
Bibliographic databases:
Document Type: Article
UDC: 519.64
MSC: 65R10, 65R20
Language: Russian
Citation: Sh. S. Khubezhty, “Quadrature formula of the highest algebraic degree of accuracy containing predefined nods”, Vladikavkaz. Mat. Zh., 25:1 (2023), 131–140
Citation in format AMSBIB
\Bibitem{Khu23}
\by Sh.~S.~Khubezhty
\paper Quadrature formula of the highest algebraic degree of accuracy containing predefined nods
\jour Vladikavkaz. Mat. Zh.
\yr 2023
\vol 25
\issue 1
\pages 131--140
\mathnet{http://mi.mathnet.ru/vmj853}
\crossref{https://doi.org/10.46698/l9013-9196-4430-x}
\mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=4567610}
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