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Journal of Functional Analysis
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Journal of Functional Analysis
Article . 2014 . Peer-reviewed
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Uniform nonsquareness and locally uniform nonsquareness in Orlicz–Bochner function spaces and applications

Uniform nonsquareness and locally uniform nonsquareness in Orlicz-Bochner function spaces and applications
Authors: Shang, Shaoqiang; Cui, Yunan;

Uniform nonsquareness and locally uniform nonsquareness in Orlicz–Bochner function spaces and applications

Abstract

The notion of uniform nonsquareness is important because, if a Banach space \( X \) has this property, then it possesses the fixed point property for nonexpansive maps on closed convex and bounded subsets of \(X\). The geometry of Köthe-Bochner spaces \(E( X)\), where \(E\) is a Banach function space (also called a Köthe space) and \(X\) is a Banach space, has been studied intensively during the last decades. Since \(E\) and \( X \) are imbedded isometrically into \(E( X) \), all geometric properties preserved by isometries (or isomorphisms) are inherited from \(E( X) \) by \(E\) and \(X\). The important question is whether \(E( X) \) has a given property whenever \(E\) and \(X\) have it. This problem has been deeply investigated in general Köthe-Bochner spaces \( E( X) \) as well as in special classes such as Lebesgue-Bochner spaces \(L^{p}( X) \) or Orlicz-Bochner spaces \( L^{\Phi }( X)\). The authors study uniform nonsquareness (Theorem 1) and local uniform nonsquareness (Theorem 2) in Orlicz-Bochner function spaces \(L^{\Phi }( X) \) equipped with the Orlicz norm over a nonatomic finite measure space \(( T,\Sigma ,\mu ) \). They give a direct proof of the necessity of Theorem 1, that is, if \(L^{\Phi }( X) \) is uniformly nonsquare, then \(X\) has the same property. However, it follows immediately from the isometric inclusion \(X\) into \(L^{\Phi }( X)\). The same is the situation of the proof of necessity in Theorem 2. Moreover, Theorem 1 can be directly concluded from known general facts concerning Köthe-Bochner spaces \(E( X)\). Namely, \textit{H. Hudzik} and \textit{T. R. Landes} studied deeply the characteristic of convexity \(\varepsilon _{0}( E( X) ) \) of a Köthe-Bochner space \(E( X) \), see [Math. Ann. 294, No. 1, 117--124 (1992; Zbl 0761.46016)]. They obtained as a corollary that \(E( X) \) is uniformly nonsquare if and only if both \(E\) and \(X\) are uniformly nonsquare (Theorem 1 in [\textit{P. Foralewski}, J. Funct. Anal. 264, No. 2, 605--629 (2013; Zbl 1263.46015)]). Thus, Theorem 1 from the present paper follows at once applying additionally criteria of uniform nonsquareness of Orlicz spaces \( L^{\Phi }\) equipped with the Orlicz norm, see [\textit{S.-T. Chen}, ``Geometry of Orlicz spaces'', Diss. Math. 356, 204 p. (1996; Zbl 0873.46018)].

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Keywords

Geometry and structure of normed linear spaces, Spaces of vector- and operator-valued functions, Orlicz-Bochner spaces, uniform nonsquareness, local uniform nonsquareness

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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!
6
Average
Top 10%
Average
hybrid