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3 papers
Overlapping transformations for approximation of continuous functions by means of repeated mean Valle Poussin
I. I. Sharapudinovab a Daghestan Scientific Centre of Russian Academy of Sciences, Makhachkala
b Vladikavkaz Scientific Centre of the Russian Academy of Sciences
Abstract:
On the basis of trigonometric sums of Fourier
$S_n(f,x)$ and classical means of Valle Poussin
$$
_1V_{n,m}(f,x)= \frac1n\sum_{l=m}^{m+n-1}S_l(f,x)
$$
in this paper, repeated mean Valle Poussin is introduced as follows
$$
_2V_{n,m}(f,x)= \frac1n\sum_{k=m}^{m+n-1}{}_1V_{n,k}(f,x),
$$
$$
{}_{l+1}V_{n,m}(f,x)= \frac1n\sum_{k=m}^{m+n-1} {}_{l}V_{n,k}(f,x)\quad(l\ge1).
$$
On the basis of the mean
$_2V_{n,m}(f,x)$ and overlapping transforms, operators that approximate continuous (in general, nonperiodic) functions are constructed and their approximative properties are investigated.
Keywords:
the repeated mean Valle Poussin, overlapping transforms, local approximative properties.
UDC:
517.538 Received: 04.12.2017
Revised: 21.12.2017
Accepted: 25.12.2017
DOI:
10.31029/demr.8.8