Articles written in Proceedings – Mathematical Sciences
Volume 112 Issue 1 February 2002 pp 107-116
We present some results on the perturbation of eigenvalues embedded at thresholds in a two channel model Hamiltonian with a small off-diagonal perturbation. Examples are given of the various types of behavior of the eigenvalue under perturbation.
Volume 116 Issue 4 November 2006 pp 375-392 Scattering Theory
We consider Schrodinger operators
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