Note on a paper of E. M. E. Zayed and S. F. M. Ibraham.
Eberhard, W., Freiling, G., Schneider, A. (1992)
International Journal of Mathematics and Mathematical Sciences
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Displaying similar documents to “The integral equation methods for the perturbed Helmholtz eigenvalue problems.”
Note on a paper of E. M. E. Zayed and S. F. M. Ibraham.
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Xue Ping Wang (2007)
Annales de la faculté des sciences de Toulouse Mathématiques
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In this article, we give a necessary and sufficient condition in the perturbation regime on the existence of eigenvalues embedded between two thresholds. For an eigenvalue of the unperturbed operator embedded at a threshold, we prove that it can produce both discrete eigenvalues and resonances. The locations of the eigenvalues and resonances are given.
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Annales Polonici Mathematici
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Annales de l'I.H.P. Physique théorique
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