On the Approximation of Isolated Eigenvalues of Ordinary Differential Operators
arXiv:math/0612622 · doi:10.1090/S0002-9939-08-09140-5
Abstract
We 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 pages