Embedding $\ell_{\infty}$ into the space of all Operators on Certain Banach Spaces

Details Embedding $\ell_{\infty}$ into the space of all Operators on Certain Banach Spaces Embedding $\ell_{\infty}$ into the space of all Operators on Certain Banach Spaces

2004-12-08

arxiv.org/abs/math/0412171v1

Mathematics

Functional Analysis

10 pages

Scientific paper

We give sufficient conditions on a Banach space $X$ which ensure that $\ell_{\infty}$ embeds in $\mathcal{L}(X)$, the space of all operators on $X$. We say that a basic sequence $(e_n)$ is quasisubsymmetric if for any two increasing sequences $(k_n)$ and $(\ell_n)$ of positive integers with $k_n \leq \ell_n$ for all $n$, we have that $(e_{k_n})$ dominates $(e_{\ell_n})$. We prove that if a Banach space $X$ has a seminormalized quasisubsymmetric basis then $\ell_{\infty}$ embeds in $\mathcal{L}(X)$.

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