Multiplication-invariant operators and the classification of LCA group frames
Multiplication-invariant operators and the classification of LCA group frames
复制标题
乘法不变算子和LCA群框架的分类
DOI:
10.1016/j.jfa.2020.108780
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发表时间:
2021
影响因子:
1.7
通讯作者:
Iverson, Joseph W.
中科院分区:
文献类型:
--
作者:
Bownik, Marcin;Iverson, Joseph W.
In this paper we study the properties of multiplication invariant (MI) operators acting on subspaces of the vector-valued space L 2 (X; 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; 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 (G), where G is a locally compact group.
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