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arXiv 0904.4102math.FAmath.OA
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某些巴拿赫代数的近似恒等式和Arens正则性

Approximate Identity and Arens Regularity of Some Banach Algebras

Kazem Haghnejad Azar, Abdolhamid Riazi

摘要:

设$A$是具有第二对偶$A^{**}$的Banach代数.如果$A$有一个有界的近似恒等式$(=BAI)$,则$A^{**}$是酉的当且仅当$A^{**}$有一个$weak^* bounded approximate $ $identity(=W^*BAI)$。如果$A$是Arens规则的,而$A$ \noindent有BAI,则$A^*$在两侧都有因子。本文引入了新的概念$LW^*W$和$RW^*W$ -性质,证明了在一定条件下,若$A$具有$LW^*W$和$RW^*W$ -性质,则$A$是Arens正则的;若$A$是Arens正则的,则$A$具有$LW^*W$和$RW^*W$ -性质.我们还提供了这些新概念在特殊代数$l^1(G), L^1(G), M(G)$和$A(G)$中的一些应用。

英文摘要:

Let $A$ be a Banach algebra with the second dual $A^{**}$. If $A$ has a bounded approximate identity $(=BAI)$, then $A^{**}$ is unital if and only if $A^{**}$ has a $weak^* bounded approximate $$identity(=W^*BAI)$. If $A$ is Arens regular and $A$ \noindent has a BAI, then $A^*$ factors on both sides. In this paper we introduce new concepts $LW^*W$ and $RW^*W$- property and we show that under certain conditions if $A$ has $LW^*W$ and $RW^*W$- property, then $A$ is Arens regular and also if $A$ is Arens regular, then $A$ has $LW^*W$ and $RW^*W$- property. We also offer some applications of these new concepts for the special algebras $l^1(G), L^1(G), M(G)$, and $A(G)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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