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arXiv 0901.2555math.CAmath.SP
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截断傅立叶算子。I

The truncated Fourier operator. I

Victor Katsnelson, Ronny Machluf

摘要:

设(\mathscr{F})是一维Fourier-Plancherel算子,(E)是实轴的子集.截断傅立叶算子是形式为(\mathscr{F}_E =P_E \mathscr{F} P_E)的算子(\mathscr{F}_E),其中((P_Ex)(t)=χ_E(t)x(t)),并且(χ_E(t))是集合(E)的指示函数。在本文的第一部分中,讨论了算子(\mathscr{F}_E)根据集合(E)的基本性质。在这些属性中,有以下一个。操作员(\mathscr{F}_E):1.有一个不平凡的零空间; 2.是严格收缩的; 3.是正规算子; 4.是希尔伯特-施密特算子; 5.是一个迹族算子。

英文摘要:

Let (\mathscr{F}) be the one dimensional Fourier-Plancherel operator and (E) be a subset of the real axis. The truncated Fourier operator is the operator (\mathscr{F}_E) of the form (\mathscr{F}_E=P_E\mathscr{F}P_E), where ((P_Ex)(t)=χ_E(t)x(t)), and (χ_E(t)) is the indicator function of the set (E). In the presented first part of the work, the basic properties of the operator (\mathscr{F}_E) according to the set (E) are discussed. Among these properties there are the following one. The operator (\mathscr{F}_E): 1. has a not-trivial null-space; 2. is strictly contractive; 3. is a normal operator; 4. is a Hilbert-Schmidt operator; 5. is a trace class operator.

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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