Summary
Inclusion intervals for the firstN eigenvalues of a second-order ordinary differential operator with boundary conditions of Sturm-Liouville or of periodic type are derived by a combination of “elementary” estimates, an appropriate numerical procedure and a homotopy algorithm.
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Plum, M. Eigenvalue inclusions for second-order ordinary differential operators by a numerical homotopy method. Z. angew. Math. Phys. 41, 205–226 (1990). https://doi.org/10.1007/BF00945108
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DOI: https://doi.org/10.1007/BF00945108