Two-sided estimates for the approximation numbers of Hardy-type operators in L∞ and L¹
Evans, W. ; Harris, D. ; Lang, J.
Studia Mathematica, Tome 129 (1998), p. 171-192 / Harvested from The Polish Digital Mathematics Library
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In [2] and [3] upper and lower estimates and asymptotic results were obtained for the approximation numbers of the operator T:Lp(ℝ+)→Lp(ℝ+) defined by (Tf)(x)≔v(x)ʃ0∞u(t)f(t)dt when 1 < p < ∞. Analogous results are given in this paper for the cases p = 1,∞ not included in [2] and [3].

Publié le : 1998-01-01
EUDML-ID : urn:eudml:doc:216550 
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     author = {W. Evans and D. Harris and J. Lang},
     title = {Two-sided estimates for the approximation numbers of Hardy-type operators in $L^{$\infty$}$ and L$^1$},
     journal = {Studia Mathematica},
     volume = {129},
     year = {1998},
     pages = {171-192},
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Evans, W.; Harris, D.; Lang, J. Two-sided estimates for the approximation numbers of Hardy-type operators in $L^{∞}$ and L¹. Studia Mathematica, Tome 129 (1998) pp. 171-192. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv130i2p171bwm/

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