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Funktsional'nyi Analiz i ego Prilozheniya, 2002, Volume 36, Issue 2, Pages 28–37
DOI: https://doi.org/10.4213/faa188
(Mi faa188)
 

This article is cited in 6 scientific papers (total in 6 papers)

The Best Extension Operators for Sobolev Spaces on the Half-Line

G. A. Kalyabinab

a S. P. Korolyov Samara State Aerospace University
b Samara Academy of Humanities
Full-text PDF (156 kB) Citations (6)
References:
Abstract: We describe the construction of extension operators with minimal possible norm $\tau_m$ from the half-line to the entire real line for the spaces $W_2^m$ and derive the asymptotic estimate $\ln\tau_m\approx K_0m$ (as $m\to\infty$), where
$$ K_0:=\frac4\pi\int_0^{\pi/4}\ln(\operatorname{\cot}x)\,dx=1.166243\ldots=\ln3.209912\dots. $$

The proof is based on the investigation of the maximum and minimum eigenvalues and the corresponding eigenvectors of some special matrices related to Vandermonde matrices and their inverses, which can be of interest in themselves.
Keywords: extrapolations with minimal norms, Vandermonde matrices.
Received: 19.10.2001
English version:
Functional Analysis and Its Applications, 2002, Volume 36, Issue 2, Pages 106–113
DOI: https://doi.org/10.1023/A:1015614406023
Bibliographic databases:
Document Type: Article
UDC: 517.518.237, 512.643.5
Language: Russian
Citation: G. A. Kalyabin, “The Best Extension Operators for Sobolev Spaces on the Half-Line”, Funktsional. Anal. i Prilozhen., 36:2 (2002), 28–37; Funct. Anal. Appl., 36:2 (2002), 106–113
Citation in format AMSBIB
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  • https://doi.org/10.4213/faa188
  • https://www.mathnet.ru/eng/faa/v36/i2/p28
  • This publication is cited in the following 6 articles:
    Citing articles in Google Scholar: Russian citations, English citations
    Related articles in Google Scholar: Russian articles, English articles
    Функциональный анализ и его приложения Functional Analysis and Its Applications
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