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Eigenvalues and resonances using the Evans function
In this expository paper, we discuss the use of the Evans function in
finding resonances, which are poles of the analytic continuation of the
resolvent. We illustrate the utility of the general theory developed
in [13, 14] by applying it to two
physically interesting test cases: the linear Schrödinger operator
and the linearization associated with the integrable nonlinear
Schrödinger equation.