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arXiv 0905.0656math.FAmath.CA
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Infinite dimensional限制可逆性

Infinite dimensional restricted invertibility

Peter G. Casazza, Goetz E. Pfander

摘要:

1987年的Bourgain-Tzafriri限制可逆性定理是分析中最著名的定理之一。在他们工作的时候,作者提出了一个可能的无限维版本的定理的问题。本文基于框架理论中的“稠密”概念,给出了无限维希尔伯特空间上算子的限制可逆性的一个相当一般的定义。然后证明了局部化Bessel系统有很大的子集是Riesz基序列。因此,我们证明了Feichtinger代数中$\ell_1$ -局部化算子和具有生成函数的Gabor框架的无限维限制可逆性定理的最强可能形式.对于我们的计算,我们引入了一个新的“密度”的概念,它比标准式有很大的优势,因为它独立于指数映射,因此有更广泛的应用。然后,我们表明,在设置的限制可逆性定理,这个新的密度变得等同于标准密度。

英文摘要:

The 1987 Bourgain-Tzafriri Restricted Invertibility Theorem is one of the most celebrated theorems in analysis. At the time of their work, the authors raised the question of a possible infinite dimensional version of the theorem. In this paper, we will give a quite general definition of restricted invertibility for operators on infinite dimensional Hilbert spaces based on the notion of "density" from frame theory. We then prove that localized Bessel systems have large subsets which are Riesz basic sequences. As a consequence, we prove the strongest possible form of the infinite dimensional restricted invertibility theorem for $\ell_1$-localized operators and for Gabor frames with generating function in the Feichtinger Algebra. For our calculations, we introduce a new notion of "density" which has serious advantages over the standard form because it is independent of index maps - and hence has much broader application. We then show that in the setting of the restricted invertibility theorem, this new density becomes equivalent to the standard density.

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