Geodesic
$q$-Bounded systems: Common approach to Fisher--Micchelli's and Bernstein--Walsh's type problems
Lobachevskii journal of mathematics, Tome 25 (2007), pp. 197-216

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We have developed a new common method to investigate geometrically fast approximation problems. Fisher–Micchelli's, Bernstein–Walsh's and Batirov–Varga's well known results are obtained as applications.
Keywords: fast approximation, n-widths, biorthogonal systems. 
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     author = {M. S. Martirosyan and S. V. Samarchyan},
     title = {$q${-Bounded} systems: {Common} approach to {Fisher--Micchelli's} and {Bernstein--Walsh's} type problems},
     journal = {Lobachevskii journal of mathematics},
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     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2007_25_a5/}
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M. S. Martirosyan; S. V. Samarchyan. $q$-Bounded systems: Common approach to Fisher--Micchelli's and Bernstein--Walsh's type problems. Lobachevskii journal of mathematics, Tome 25 (2007), pp. 197-216. http://geodesic.mathdoc.fr/item/LJM_2007_25_a5/