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Embedded eigenvalues for asymptotically periodic ODE systems
Sara Maad Sasane, Wilhelm Treschow
We investigate the persistance of embedded eigenvalues under perturbations of a certain self-adjoint Schrödinger-type differential operator in , with…
Perturbations of embedded eigenvalues for self-adjoint ODE systems
Sara Maad Sasane, Alexia Papalazarou
We consider a perturbation problem for embedded eigenvalues of a self-adjoint differential operator in . In particular, we study the set of all small pe…
Perturbations of embedded eigenvalues for the planar bilaplacian
Gianne Derks, Sara Maad Sasane, Bjorn Sandstede
Operators on unbounded domains may acquire eigenvalues that are embedded in the essential spectrum. Determining the fate of these embedded eigenvalues under small perturbations of…
Persistence of embedded eigenvalues
Shmuel Agmon, Ira Herbst, Sara Maad Sasane
We consider conditions under which an embedded eigenvalue of a self-adjoint operator remains embedded under small perturbations. In the case of a simple eigenvalue embedded in cont…