Mathematics – Functional Analysis
Scientific paper
2008-09-12
Mathematics
Functional Analysis
26 pages. Submitted for publication. This is a replacement submission. The paper is unchanged but the "Comments" field has bee
Scientific paper
We show that a separable real Banach space embeds almost isometrically in a space $Y$ with a shrinking 1-unconditional basis if and only if $\lim_{n \to \infty} \|x^* + x_n^*\| = \lim_{n \to \infty} \|x^* - x_n^*\|$ whenever $x^* \in X^*$, $(x_n^*)$ is a weak$^*$-null sequence and both limits exist. If $X$ is reflexive then $Y$ can be assumed reflexive. These results provide the isometric counterparts of recent work of Johnson and Zheng.
Cowell S. R.
Kalton Nigel J.
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