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Asymptotically isometric copies of c0 and l1 in certain Banach spaces

Asymptotically isometric copies of \(c_{0}\) and \(l^{1}\) in certain Banach spaces.
Authors: Chen, Dongyang;

Asymptotically isometric copies of c0 and l1 in certain Banach spaces

Abstract

The notions of a Banach space containing asymptotically isometric copies of \(c_0\) or \(\ell^1\) first appeared in investigations of the fixed point property [Proc. Am. Math. Soc. 125, 443--446 (1997; Zbl 0861.47032)] and in the structure of classical Banach spaces [Bull. Polish Acad. Sci. Math. 48, 1--12 (2000; Zbl 0956.46006)]. In this article, the author considers asymptotically isometric analogues of results concerning Banach spaces that contain isomorphic copies of \(c_0\), \(\ell^1\), or \(\ell^\infty\). For example, \textit{W. B. Johnson} and \textit{H. Rosenthal} [Stud. Math. 43, 77--92 (1972; Zbl 0231.46035)] showed that if \(X\) is a separable Banach space whose dual contains an isomorphic copy of \(\ell^1\), then there is a quotient space of \(X\) isomorphic to \(c_0\). The author of this article proves that if \(X\) is a separable Banach space, then \(X^*\) contains an asymptotically isometric copy of \(\ell^1\) if and only if there is a quotient space of \(X\) asymptotically isometric to \(c_0\). The author also shows that, if \(X\) and \(Y\) are infinite-dimensional Banach spaces and \(Y\) contains an asymptotically isometric copy of \(c_0\), then the space \(L(X,Y)\) of bounded linear operators from \(X\) to \(Y\) contains an isometric copy of \(\ell^\infty\) (an analogue of a result of \textit{J. C. Ferrando} [Math. Scand. 77, 148--152 (1995; Zbl 0853.46031)]) and the space \(K_{w^*}(X^*,Y)\) of compact, weak*-weak continuous linear operators from \(X^*\) to \(Y\) contains a complemented, asymptotically isometric copy of \(c_0\) (an analogue of a result of \textit{R. A. Ryan} [Proc. R. Irish. Acad., Sect. A 91, 239--241 (1991; Zbl 0725.46020)]).

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Keywords

Applied Mathematics, Isometric theory of Banach spaces, Classical Banach spaces in the general theory, Spaces of operators; tensor products; approximation properties, asymptotically isometric copy, Analysis

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
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