Geodesic
Approximation of functions of two variables
Acta mathematica Universitatis Comenianae, Tome 74 (2005) no. 1 
Z. Walczak. Approximation of functions of two variables. Acta mathematica Universitatis Comenianae, Tome 74 (2005) no. 1. http://geodesic.mathdoc.fr/item/AMUC_2005_74_1_a3/
@article{AMUC_2005_74_1_a3,
     author = {Z. Walczak},
     title = {Approximation of functions of two variables},
     journal = {Acta mathematica Universitatis Comenianae},
     year = {2005},
     volume = {74},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/AMUC_2005_74_1_a3/}
}
TY  - JOUR
AU  - Z. Walczak
TI  - Approximation of functions of two variables
JO  - Acta mathematica Universitatis Comenianae
PY  - 2005
VL  - 74
IS  - 1
UR  - http://geodesic.mathdoc.fr/item/AMUC_2005_74_1_a3/
ID  - AMUC_2005_74_1_a3
ER  - 
%0 Journal Article
%A Z. Walczak
%T Approximation of functions of two variables
%J Acta mathematica Universitatis Comenianae
%D 2005
%V 74
%N 1
%U http://geodesic.mathdoc.fr/item/AMUC_2005_74_1_a3/
%F AMUC_2005_74_1_a3

Voir la notice de l'article provenant de la source Comenius University

We introduce certain positive linear operators in weighted spaces of functions of two variables and we study approximation properties of these operators. We give theorems on the degree of approximation of functions from polynomial and exponential weighted spaces by introduced operators, using norms of these spaces.