The discrete character of the spectrum of a linear two-point boundary- value problem with constraints at singular points
Kurochkin, S. V.;
The discrete character of the spectrum of a linear two-point boundary- value problem with constraints at singular points
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estimate, two-point boundary-value problem, differential equations, Eigenvalues, estimation of eigenvalues, upper and lower bounds of ordinary differential operators, linear ordinary, increase in the eigenvalues, constraints, General spectral theory of ordinary differential operators, singularities, spectrum
estimate, two-point boundary-value problem, differential equations, Eigenvalues, estimation of eigenvalues, upper and lower bounds of ordinary differential operators, linear ordinary, increase in the eigenvalues, constraints, General spectral theory of ordinary differential operators, singularities, spectrum