One-Dimensional Schrodinger Operator with a Negative Parameter and Its Applications to the Study of the Approximation Numbers of a Singular Hyperbolic Operator

Mussakan Muratbekov, Madi Mussakanovich Muratbekov


In this paper we use the one-dimensional Schr\"odinger operator with a negative parameter to the study the approximation numbers of a singular hyperbolic operator. Estimates for the distribution function of the approximation numbers are obtained in the paper.

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