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APPROXIMATION NUMBERS OF SOBOLEV EMBEDDING OPERATORS ON AN INTERVAL

Published online by Cambridge University Press:  23 July 2004

CHRISTER BENNEWITZ  and
YOSHIMI SAITŌ
CHRISTER BENNEWITZ
Affiliation:
Department of Mathematics, Lund University, Box 118, 221 00, Swedenchrister.bennewitz@math.lu.se
YOSHIMI SAITŌ
Affiliation:
Department of Mathematics, University of Alabama, Birmingham, AL 35 294, USAsaito@math.uab.edu
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Abstract

Consider the Sobolev embedding operator from the space of functions in $W^{1,p}(I)$ with average zero into $L^p$, where $I$ is a finite interval and $p\,{>}\,1$. This operator plays an important role in recent work. The operator norm and its approximation numbers in closed form are calculated. The closed form of the norm and approximation numbers of several similar Sobolev embedding operators on a finite interval have recently been found. It is proved in the paper that most of these operator norms and approximation numbers on a finite interval are the same.

Keywords

46E3546E3947B1047G10
Type
Notes and Papers
Information
Journal of the London Mathematical Society , Volume 70 , Issue 1 , August 2004 , pp. 244 - 260
Copyright
The London Mathematical Society 2004

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