Invariant approximations
Mathematica Applicanda, Tome 9 (1981) no. 17.

Voir la notice de l'article dans European Digital Mathematics Library

From the text: "We generalize a theorem of G. Meinardus [Arch. Rational Mech. Anal. 14 (1963), 301–303; MR0156143] in two directions: first, instead of concrete function spaces we consider arbitrary normed spaces and secondly, we deal with the subspace of models-approximating elements-that can be of arbitrary measure. The operator in regard to which we study the invariability of the approximation is linear.''
Mots-clés : Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) 
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Antoni Smoluk. Invariant approximations. Mathematica Applicanda, Tome 9 (1981) no. 17. https://geodesic-test.mathdoc.fr/item/MA_1981__9_17_292978/