Geodesic
On approximate properties of solutions of a~nonlinear mixed-type equation
Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 5, pp. 95-107.

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In the paper, we obtain sufficient solvability conditions of a certain boundary-value problem for a nonlinear mixed-type equation and finds upper and lower estimates for Kolmogorov widths of the solution set. 
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M. B. Muratbekov; M. M. Muratbekov; K. N. Ospanov. On approximate properties of solutions of a~nonlinear mixed-type equation. Fundamentalʹnaâ i prikladnaâ matematika, Tome 12 (2006) no. 5, pp. 95-107. http://geodesic.mathdoc.fr/item/FPM_2006_12_5_a8/

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