Simultaneous approximation in negative norms of arbitrary order
ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 15 (1981) no. 3, p. 231-235
@article{M2AN_1981__15_3_231_0,
author = {Helfrich, Hans-Peter},
title = {Simultaneous approximation in negative norms of arbitrary order},
journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique},
publisher = {Dunod},
volume = {15},
number = {3},
year = {1981},
pages = {231-235},
zbl = {0495.41010},
mrnumber = {631677},
language = {en},
url = {http://www.numdam.org/item/M2AN_1981__15_3_231_0}
}

Helfrich, Hans-Peter. Simultaneous approximation in negative norms of arbitrary order. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Volume 15 (1981) no. 3, pp. 231-235. http://www.numdam.org/item/M2AN_1981__15_3_231_0/

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