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The Problem of A. F. Timan on the Precise Order of Decrease of the Best Approximations

✍ Scribed by R.K.S. Rathore


Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
470 KB
Volume
77
Category
Article
ISSN
0021-9045

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✦ Synopsis


The problem of Timan on finding a necessary and sufficient condition for (A_{\sigma}(f){L{q}} \sim \omega_{k}(f ; 1 / \sigma){L{q}}, \sigma \rightarrow \infty), is solved. The condition is (\omega_{k}(f ; \delta){L{q}} \sim \omega_{k+1}(f ; \delta){L{q}}), (\delta \rightarrow 0). Related problems in other situations have also been studied. (C 1994) Academic Press, Inc.


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Bos and Liang have separately proved that the Kergin interpolants with respect to distinguished nodes on the unit disk are best approximations of the monomials in the infinity norm. These results are extended by characterizing the nodes as solutions of a system of nonlinear equations. Thus, it is po