Approximation of functions and quadrature formulas
Let $l^h$ is a functional of errors for quadrature formulas
begin{equation}
label{1}
(l^h,f)=intlimits_a^bf(x)dx -hsum_{i=0}^{n}c_i f(a+ih),
end{equation}
$a
Note. Abstracts are published in author's edition
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