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. 
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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/

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