研究无限维空间l2在概率框架和平均框架下的逼近特征,得到了l2在lq(2≤q≤∞)中的kohnogorov (n,δ)-宽度及p-平均kolmogorov n-宽度的精确阶.%In this paper, the authors study the approaching characteristics of infinite-space l2, in probabilistic setting and average case setting, and obtain the sharp order of kolmogorov (n,δ)-width and p-average kolmogorov ra-width of l2 in lq(2≤q≤∞)metric.
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