On the Approximation of Isolated Eigenvalues of Ordinary Differential Operators

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/159067We extend a result of Stolz and Weidmann on the approximation of isolated eigenvalues of singular Sturm-Liouville and Dirac operators by the eigenvalues of regular operators.4 pagesSpectral TheoryMathematical PhysicsPrimary 34L40, 34L16; Secondary 47N50, 34B20On the Approximation of Isolated Eigenvalues of Ordinary Differential Operatorstext