Geodesic
On the orthorecursive expansion with respect to a certain function system with computational errors in the coefficients
Sbornik. Mathematics, Tome 195 (2004) no. 7, pp. 935-949 Cet article a éte moissonné depuis la source Math-Net.Ru

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Orthorecursive expansions with computational errors in the coefficients are considered. An example of a system of functions on an interval of the real axis is presented such that the corresponding orthorecursive expansion converges to the expanded element for arbitrary errors satisfying certain rather weak conditions. For various classes of expanded functions results on a.e. convergence, convergence in the $L^p$-metrics ($1\leqslant p<\infty$), and uniform convergence are established. 
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V. V. Galatenko. On the orthorecursive expansion with respect to a certain function system with computational errors in the coefficients. Sbornik. Mathematics, Tome 195 (2004) no. 7, pp. 935-949. http://geodesic.mathdoc.fr/item/SM_2004_195_7_a1/

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