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Entropy numbers of general diagonal operators.

Thomas Kühn (2005)

Revista Matemática Complutense

We determine the asymptotic behavior of the entropy numbers of diagonal operators D: lp → lq, (xk) → (skxk), 0 < p,q ≤ ∞, under mild regularity and decay conditions on the generating sequence (σk). Our results extend the known estimates for polynomial and logarithmic diagonals (σk). Moreover, we also consider some exotic intermediate examples like (σk)=exp(-√log k).

Factoring Rosenthal operators.

Teresa Alvarez (1988)

Publicacions Matemàtiques

In this paper we show that a Rosenthal operator factors through a Banach space containing no isomorphs of l1.

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