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Interpolation of the essential spectrum and the essential norm

A. G. AksoyH.-O. Tylli — 2005

Banach Center Publications

The behavior of the essential spectrum and the essential norm under (complex/real) interpolation is investigated. We extend an example of Albrecht and Müller for the spectrum by showing that in complex interpolation the essential spectrum σ e ( S [ θ ] ) of an interpolated operator is also in general a discontinuous map of the parameter θ. We discuss the logarithmic convexity (up to a multiplicative constant) of the essential norm under real interpolation, and show that this holds provided certain compact approximation...

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