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arXiv math/9305203math.FA
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随机巴拿赫空间。该方法的局限性

Random Banach spaces. The limitations of the method

P. Mankiewicz, Stanislaw J. Szarek

摘要:

本文研究了在Grassmann流形上的Haar测度意义下,给定维数的l^N_infinity子空间的“一般”性质.我们证明了这样一个子空间上的每一个“良有界”算子,比如说E,都是一个单位元的倍数的“小”扰动,其中“小”是根据E的几何性质内在地定义的。在相反的方向上,我们证明了这样的“l^N_infinity的一般子空间”允许“非平凡的有界”投影,这表明了第一个结果的“近最优性”,并在“一般”情况下证明了所谓的“Pisier二分猜想”。

英文摘要:

We study the properties of "generic", in the sense of the Haar measure on the corresponding Grassmann manifold, subspaces of l^N_infinity of given dimension. We prove that every "well bounded" operator on such a subspace, say E, is a "small" perturbation of a multiple of identity, where "smallness" is defined intrinsically in terms of the geometry of E. In the opposite direction, we prove that such "generic subspaces of l^N_infinity" do admit "nontrivial well bounded" projections, which shows the "near optimality" of the first mentioned result, and proves the so called "Pisier's dichotomy conjecture" in the "generic" case.

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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