Summing inclusion maps between symmetric sequence spaces
Andreas Defant, Mieczysław Mastyło, Carsten Michels
Abstract
We prove a substantial extension of a well-known result due to Bennett and Carl: The inclusion of a 2-concave symmetric Banach sequence space E into l2 is (E,1)-summing, i.e. for every unconditionally summable sequence (xn) in E the scalar sequence (||xn||2) is contained in E. Various applications are given, e.g. to the theory of eigenvalue distribution of compact operators and approximation theory.
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