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- W1481330486 abstract "With the essential spectrum of a self-adjoint operator given a relatively trace class perturbation one can associate an integer-valued invariant which admits different descriptions as the singular spectral shift function, total resonance index, and singular $mu$-invariant. In this paper we give a direct proof of the equality of the total resonance index and singular $mu$-invariant assuming only the limiting absorption principle. The proof is based on an application of the argument principle to the poles and zeros of the analytic continuation of the scattering matrix considered as a function of the coupling parameter." @default.
- W1481330486 created "2016-06-24" @default.
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- W1481330486 date "2015-01-30" @default.
- W1481330486 modified "2023-09-27" @default.
- W1481330486 title "Resonance index and singular mu-invariant" @default.
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