Geodesic
Spectra of nonlinear differential equations and widths of Sobolev classes
Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 427-446 Cet article a éte moissonné depuis la source Math-Net.Ru

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The authors study the problem of Kolmogorov widths of Sobolev classes $W_p^r([0,1])$ of functions in the $L_q$-metric, $p\geqslant q$, and the connected questions of the existence and uniqueness of the spectra of nonlinear equations. 
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A. P. Buslaev; V. M. Tikhomirov. Spectra of nonlinear differential equations and widths of Sobolev classes. Sbornik. Mathematics, Tome 71 (1992) no. 2, pp. 427-446. http://geodesic.mathdoc.fr/item/SM_1992_71_2_a10/

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