arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1912.04420math.FAmath.GRmath.OA
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乘不变算子与LCA群框架的分类

Multiplication-invariant operators and the classification of LCA group frames

Marcin Bownik, Joseph W. Iverson

摘要:

本文研究了作用在向量值空间$L^2(X;\mathcal H)$的子空间上的乘不变算子的性质。我们的特点,这样的运营商的范围函数表明,有一个同构之间的MI空间(MI运营商作为态射)和范畴的可测范围函数的态射是可测范围运营商的范畴。我们研究了MI算子的全局性质如何被其相应的值域算子的局部逐点性质所反映。我们还建立了几个结果产生的帧的乘法在$L^2(X;\mathcal H)$。这包括分类框架的乘法相对于酉等价的可测领域的Gramian。最后,我们展示了我们的结果在研究阿贝尔群框架和作用在$L^2(\mathcal G)$的子空间上的平移不变(TI)算子中的应用,其中$\mathcal G$是局部紧群。

英文摘要:

In this paper we study the properties of multiplication invariant (MI) operators acting on subspaces of the vector-valued space $L^2(X;\mathcal H)$. We characterize such operators in terms of range functions by showing that there is an isomorphism between the category of MI spaces (with MI operators as morphisms) and the category of measurable range functions whose morphisms are measurable range operators. We investigate how global properties of an MI operator are reflected by local pointwise properties of its corresponding range operator. We also establish several results about frames generated by multiplications in $L^2(X;\mathcal H)$. This includes the classification of frames of multiplications with respect to unitary equivalence by measurable fields of Gramians. Finally, we show applications of our results in the study of abelian group frames and translation-invariant (TI) operators acting on subspaces of $L^2(\mathcal G)$, where $\mathcal G$ is a locally compact group.

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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