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arXiv math/0606317math.FA
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巴拿赫空间中的系数量子化

Coefficient Quantization in Banach Spaces

S. J. Dilworth, E. Odell, Th. Schlumprecht, Andras Zsak

摘要:

设(e_i)是可分巴拿赫空间X的字典.我们考虑的问题近似的线性组合的字典元素与量化系数通常从一个“有限的字母表”。我们研究了这种类型的几个逼近性质,并将它们与X的巴拿赫空间几何联系起来。证明了具有上述性质之一(即系数量子化性质)的全极小系统的存在性等价于X包含c_0。

英文摘要:

Let (e_i) be a dictionary for a separable Banach space X. We consider the problem of approximation by linear combinations of dictionary elements with quantized coefficients drawn usually from a `finite alphabet'. We investigate several approximation properties of this type and connect them to the Banach space geometry of X. The existence of a total minimal system with one of these properties, namely the coefficient quantization property, is shown to be equivalent to X containing c_0.

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