EPSILON-ISOMETRIC EMBEDDINGS

被引:47
|
作者
QIAN, SW
机构
关键词
EPSILON-ISOMETRY; BANACH SPACE; LINEAR OPERATOR; ISOMETRY;
D O I
10.2307/2160993
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
In this paper we study into epsilon-isometries. We prove that if phi is an epsilon-isometry from L(p)(Omega(1), Sigma(1), mu(1)) into L(p)(Omega(2), Sigma(2), mu(2)) (for some p, 1 < p < infinity), then there is a linear operator T : L(p)(Omega(2), Sigma(2), mu(2)) --> L(p)(Omega(1), sigma(1), mu(1)) with parallel to T parallel to = 1 such that parallel to T o phi(f) - f parallel to less than or equal to 6 epsilon for each f epsilon L(p)(Omega(1), Sigma(1), mu(1)). This forms a link between an into isometry result of Figiel and a surjective epsilon-isometry result of Gevirtz in the case of L(p) spaces.
引用
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页码:1797 / 1803
页数:7
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