Geodesic
The information Kolmogorov width and some exact inequalities between widths
Izvestiya. Mathematics , Tome 71 (2007) no. 3, pp. 603-627

Voir la notice de l'article provenant de la source Math-Net.Ru

We introduce a new type of width, estimate its order for a class of functions of several variables and derive some exact inequalities connecting the classical widths. 
@article{IM2_2007_71_3_a7,
     author = {E. M. Skorikov},
     title = {The information {Kolmogorov} width and some exact inequalities between widths},
     journal = {Izvestiya. Mathematics },
     pages = {603--627},
     publisher = {mathdoc},
     volume = {71},
     number = {3},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2007_71_3_a7/}
}
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E. M. Skorikov. The information Kolmogorov width and some exact inequalities between widths. Izvestiya. Mathematics , Tome 71 (2007) no. 3, pp. 603-627. http://geodesic.mathdoc.fr/item/IM2_2007_71_3_a7/