Geodesic
Gel'fand widths of certain classes of analytic functions
Sbornik. Mathematics, Tome 82 (1995) no. 1, pp. 223-229 
O. G. Parfenov. Gel'fand widths of certain classes of analytic functions. Sbornik. Mathematics, Tome 82 (1995) no. 1, pp. 223-229. http://geodesic.mathdoc.fr/item/SM_1995_82_1_a10/
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Voir la notice de l'article provenant de la source Math-Net.Ru

A formula, generalizing certain earlier known formulas of the same type, is obtained for the $n$th Gel'fand width of the imbedding operator $$ J\colon X^2(G)\to L_\infty(E), $$ where $G$ is a domain in $\mathbb{C}^m$ and $X^2(G)$ is some Hilbert space of analytic functions in $G$ with a reproducing kernel.

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