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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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/

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