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Bennett-Carl inequalities for symmetric Banach sequence spaces and unitary ideals

Andreas Defant, Carsten Michels

math.FAarXiv:math/9904157

Abstract

We prove an abstract interpolation theorem which interpolates the (r,2)-summing and (s,2)-mixing norm of a fixed operator in the image and the range space. Combined with interpolation formulas for spaces of operators we obtain as an application the original Bennett-Carl inequalities for identities acting between Minkowski spaces lu as well as their analogues for Schatten classes Su. Furthermore, our techniques motivate a study of Bennett-Carl inequalities within a more general setting of symmetric Banach sequence spaces and unitary ideals.

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