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The Bochner–Schoenberg–Eberlein Property for Vector-Valued $$\ell ^p$$ℓp -Spaces
Mediterranean Journal of Mathematics ( IF 1.1 ) Pub Date : 2020-05-21 , DOI: 10.1007/s00009-020-01532-4
Z. Kamali , F. Abtahi

Let X be a non-empty set, \({\mathcal {A}}\) be a commutative Banach algebra, and \(1\le p<\infty \). In this paper, we establish some basic properties of \(\ell ^p(X,\mathcal {A})\), inherited from \({\mathcal {A}}\). In particular, we characterize the Gelfand space of \(\ell ^p(X,\mathcal {A})\), denoted by \(\Delta (\ell ^p(X,{\mathcal {A})})\). Mainly, we investigate the BSE property of the Banach algebra \(\ell ^p(X,\mathcal {A})\). In fact, we prove that \(\ell ^p(X,\mathcal {A})\) is a BSE algebra if and only if X is finite and \(\mathcal {A}\) is a BSE algebra. Furthermore, in the case that \(\mathcal {A}\) is unital, we show that for any natural number n, all continuous bounded functions on \(\Delta (\ell ^p(X,{\mathcal {A}}))\) are n-BSE functions. However, through an example, we indicate that there is some continuous bounded function on \(\Delta (\ell ^p(X,{\mathcal {A}}))\) which is not BSE. Finally, we prove that if \(\ell ^1(X,{\mathcal {A}})\) is a BSE-norm algebra, then \(\mathcal {A}\) is so. We also prove the converse of this statement, whenever \(\mathcal {A}\) is a supremum norm algebra.

中文翻译:

向量值$$ \ ell ^ p $$ℓp-空间的Bochner–Schoenberg–Eberlein属性

X为非空集,\({\ mathcal {A}} \)为可交换Banach代数,而\(1 \ le p <\ infty \)。在本文中,我们建立了\(\ ell ^ p(X,\ mathcal {A})\)的一些基本属性,它们继承自\({\ mathcal {A}} \)。特别是,我们表征\(\ ell ^ p(X,\ mathcal {A})\)的Gelfand空间,用\(\ Delta(\ ell ^ p(X,{\ mathcal {A})})表示\)。我们主要研究Banach代数\(\ ell ^ p(X,\ mathcal {A})\)的BSE性质。实际上,我们证明\(\ ell ^ p(X,\ mathcal {A})\)是BSE代数,当且仅当X是有限的且\(\ mathcal {A} \)是BSE代数。此外,在\(\ mathcal {A} \)是单位的情况下,我们表明对于任何自然数n\(\ Delta(\ ell ^ p(X,{\ mathcal {A} }))\)是n-BSE函数。但是,通过一个示例,我们表明\(\ Delta(\ ell ^ p(X,{\ mathcal {A}}))\)上存在一些连续的有界函数,而不是BSE。最后,我们证明如果\(\ ell ^ 1(X,{\ mathcal {A}})\)是BSE范数代数,则\(\ mathcal {A} \)就是BSE范数代数。每当\(\ mathcal {A} \)是一个最高范数代数时,我们还证明了该陈述的相反含义。
更新日期:2020-05-21
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