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The structure of shift-invariant subspaces of L-2(R-n)

机译:L-2(R-n)的移位不变子空间的结构

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Using the range function approach to shift invariant spaces in L-2(R ") we give a simple characterization of frames and Riesz families generated by shifts of it countable set of generators in terms of their behavior on subspaces of l(2)(Z(n)). This in turn gives a simplified approach to the analysis of frames and Riesz families done by Gramians and dual Gramians. We prove a decomposition of a shift invariant space into the orthogonal sum of spaces each of which is generated by a quasi orthogonal generator. As an application of this fact we characterize shift preserving operators in terms of range operators and prove some facts about the dimension function. (C) 2000 Academic Press. [References: 11]
机译:使用范围函数方法来移位L-2(R“)中的不变空间,我们就其可数生成器集的移位,根据它们在l(2)(Z (n))。反过来,这提供了一种简化的方法来分析由Gramians和对偶Gramians完成的框架和Riesz族,我们证明了将位移不变空间分解为正交空间之和,每个空间都是由一个准生成的正交发生器。作为这一事实的应用,我们用范围算子表征了移位保持算子的特征,并证明了有关维函数的一些事实。(C)2000 Academic Press。[参考:11]

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