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Soit une transformée de Stieltjes. Notant un prolongement de la fonction à , on définit, pour tout espace de Banach et pour tout opérateur sur qui soit de domaine dense, fermé, d’ensemble résolvant contenant et qui vérifie , un opérateur qui est un opérateur sur de même nature que . On montre que l’on a (où désigne le spectre étendu). En outre, l’opération a d’excellentes propriétés de stabilité. En particulier, si et si est un potentiel abstrait, est un potentiel...
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 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...
Sea H un espacio de Hilbert complejo, separable y de dimensión infinita. Denotaremos por L(H) al álgebra de todos los operadores acotados en H. Carl Pearcy en 1977 introdujo el concepto de figura espectral de un operador T en L(H) [13]. Sin lugar a dudas hay dos resultados que hacen de la figura espectral de un operador un concepto importante. El primero se debe a Brown, Douglas y Fillmore:"Dos operadores esencialmente normales son débilmente equivalentes si y sólo si tienen la misma figura espectral".El...
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